Starting in the wee hours of Friday, November 19, the upcoming Beaver Moon eclipse will be the longest partial lunar eclipse in six centuries, clocking in at nearly 3 ½ hours. Visible throughout North American, this celestial occurrence also is a reminder that stargazing nights are among many events available at State Parks, some of which have relationships with local astronomy clubs.
But to start, a naturalist question: Why is this upcoming full moon that will undergo this eclipse called the Beaver Moon? Well, according to state DEC naturalist Tom Lake, this description originates with the Indigenous peoples of the Northeast, who in November observed that beaver would stock up provisions to get through the coming winter when ponds, lakes, and other waterways freeze over. Beaver instinctively collect forage, including branches, limbs, even small trees, dragging it into their ponds, and securing it on the bottom for later retrieval as needed during the cold and ice of mid-winter.
Now, what about this lunar eclipse? What will happen, when will it happen and how best to observe it? According to the National Aeronautics and Space Administration, during the peak of the eclipse, the earth’s shadow will cover 97 percent of the moon’s surface, likely casting the moon in a dark, rusty reddish color.
The partial eclipse phase will last 3 hours, 28 minutes and 24 seconds, making it the longest partial eclipse in nearly 600 years! But to see this cosmic dance of earth, moon and sun unfold, two things are needed: Clear nighttime skies and a willingness to be awake when most people normally are asleep.
When the eclipse starts at 1:02 a.m. on Nov. 19, as the earth begins to pass between the sun and the moon, the changes initially will be subtle and difficult to see. That is because the earth actually casts two types of shadows _ a lighter, broader shadow known as the penumbra and a full, dark shadow, called the umbra. After initially entering the penumbra, the full moon will start entering the umbra at 2:18 a.m., gradually darkening and reddening until maximum eclipse is reached at 4:02 a.m. The moon then will start exiting the umbra, followed by the penumbra, until the eclipse ends completely at 7:03 a.m.
No special equipment is needed to safely observe a lunar eclipse, unlike a solar eclipse, which should never be looked at directly without special protective gear. A pair of binoculars can reveal more detail of the moon’s surface. For photography buffs, NASA has tips here for how to best photograph the moon and eclipses.
In State Parks’ Long Island Region, several Parks will remain open for those who want to observe the Beaver Moon eclipse. A requirement for a stargazing permit, which is normally needed to be in those parks after normal operating hours, is being waived for this event.
Long Island State Parks that will remain open for viewing are:
Upstate, the light pollution that present around metropolitan New York City is not as much of an issue, so finding a place to see the eclipse will be relatively simple.
Some of the darkest night skies in the New York are found in the Adirondack Region, and the John Brown Farm State Historic Site outside of Lake Placid will be open that night and morning with a telescope available for visitors who want to see the Beaver Moon eclipse.
And for those interested in astronomy, keep in mind that State Parks offer a variety of stargazing events throughout the year, with a calendar listing available here.
At Moreau Lake State Park in Saratoga County, a telescope will be is expected available for visitors on the night of Dec. 14 for the Geminids meteor shower, which can produce up to 120 meteors a minute. Fort Niagara State Park will also be open Dec. 13 for the meteor shower.
Twice a year, billions of birds migrate throughout the United States between their wintering and breeding grounds. These birds typically migrate south in the fall and will migrate north again in the spring. That means right now in New York State, birds are passing through as they travel down south to warmer climates. All types of birds will be seen migrating during the seasons, including warblers, shorebirds, raptors, and more.
Birds will usually spend their days saving their energy, resting, and finding food sources and during the night will use most of their energy flying. Migratory birds are typically nocturnal travelers, which means they gain the most mileage during the night hours. While we are asleep after an event filled day, there can be an estimated 150 million to upwards of 300 million birds travelling overhead in one given night. Even though the day is over for us and is our time to relax and unwind, the night hours are highly active for migrating birds!
Nighttime migration poses different threats to these birds, particularly in big cities. Large buildings are typically lit up with hundreds of bright lights throughout all hours of the night. This light pollution can significantly change birds’ behaviors, including migration patterns, foraging for food, and communication with other birds in the area. Light pollution can distract the birds as they might start to think it is daytime, because they cannot process light sources like we can. All of these behaviors are a waste of energy for birds, making their long journey much more dangerous.
According to the National Park Service, nighttime light pollution in the U.S. has gotten much worse in decades after World War II, so much that now eight in ten Americans can no longer see the Milky Way. And this is an increasing issue for migrating birds.
Birds and State Parks
New York State Parks are a great place to visit to catch a view of migrating birds. The forests, meadows, wetlands, and other natural areas in State Parks provide some of the most crucial habitats for these birds along their journey, and have helped them survive over the years by offering shelter and food. In some parks there are specific areas designated as Bird Conservation Areas (BCAs). Of the 62 BCAs throughout the state, 27 are within State Parks.
An area can be designated as a BCA if it is judged as important habitat for one or more species based on certain criteria. There are many BCA locations throughout the state, such as Saratoga Spa State Park that is home to more than 100 different bird species. You can find the location of Saratoga Spa State Park and other BCAs on the map provided below and the State Parks website. You can also check the State Parks events list for birding events near you!
In addition to BCAs, there are also areas recognized nationwide by the National Audubon Society to help protect birds and their habitats; Important Bird Areas (IBAs). One example in New York State is Rockefeller State Park Preserve in Westchester county, and is home to 180 different bird species! Check out the National Audubon Website to see Rockefeller State Park Preserve and all the other IBAs in New York State.
What Is The “Lights Out” Movement?
The “Lights Out” movement is a nationwide event that was created in in Chicago in 1999 by the National Audubon Society to help reduce the number of bird fatalities. Since then, the effort has spread to cities including Atlanta, Baltimore, Boston, Cleveland, Dallas, Denver, Detroit, Kansas City, Milwaukee, Philadelphia, Pittsburgh, Portland, Salt Lake City, San Francisco, St. Louis and Washington, D.C.
Bird fatalities are more directly caused by the amount of energy birds are wasting during the night because of the heavy light pollution across the United States. This energy is being wasted on flying around, using more vocalization and the exhaustion is leaving them more vulnerable to other threats around them.
If you’re interested in watching migrations, a tool that can be used is the BirdCast migration tool. This website has many resources for nationwide and local monitoring. The nationwide mapping tools include a live forecast of the density of the birds migrating as well as a 3-day prediction forecast of what it could look like. In addition to the nationwide prediction forecast, you can also check out a live animated video of the current migration patterns each day!
Another neat tool that this website includes is a live local alerting map that is specific for a county, city, or town. The local maps tell you how many birds to expect flying over your area that night and what the next couple nights look like as well. This tool provides important information so you can participate in helping the birds during their migration.
There are two large windows for bird migrations; one in the fall and one in the spring. Bird migration can take place from August through November with peak migration in October in the fall and from March through June with peak migration in May in the spring. Check out the links provided above to get more information on BirdCast and when peak migration is happening in your area!
How Can You Help?
Some suggestions to help get you started with the Lights Out Movement for nighttime hours:
Turn off exterior decorative lighting
Turn off interior lighting, or use curtains and blinds
Install automatic motion sensors and controls wherever possible
After visiting State Parks and seeing the many different species of birds that are in New York State, it is important for all of us to do our part to help keep them safe. The National Audubon Society provides suggestions on how to decrease light pollution on a local level, which will help birds during their migration. It is estimated that 253 million annual bird deaths from collisions are from residential areas compared to 340 million from tall buildings and skyscrapers. Your part at home is just as important as businesses!
Participating in the Lights Out movement helps more birds safely reach their migration grounds, giving you and your family more opportunities to see them in New York State Parks! To make an official pledge with the movement, sign up here.
When we think about spring and fall in the northeast, we often dwell on the extraordinary changes that occur to our trees and other plants. In the spring, we yearn for green to replace the barren gray and white of winter; in fall we marvel at the warm oranges, reds, and yellows that are on…
On February 24, 2009, two visitors to Betty and Wilbur Davis State Park were enjoying a sunny walk on Davis Road when two BIG birds flew overhead, going north. “Golden Eagles!” exclaimed these experienced bird watchers. Both were volunteers at the Delaware Otsego Audubon Society’s (DOAS) Franklin Mountain Hawk Watch which is known for its…
About four times each year, State Parks adds a variety of properties to the State Register of Historic Places, a step towards later being listed on the National Register of Historic Places as important pieces of America’s broad cultural heritage.
But while the vast majority of these listings are buildings, like factories, churches, homes, libraries or schools, that’s not always the case. Sometimes, Parks’ historic researchers like me working on the register listings get to take on the story of something truly out of this world.
Science fiction fans worldwide recognize the name “Enterprise” as the name of the starship in iconic 1960s television series Star Trek. A decade after the show went off the air, those fans helped see to it that America’s first prototype of a reusable orbiting spacecraft would also carry that name. In 2013 I was honored to document that historical connection as part of support for the listing the NASA Space Shuttle Enterprise on the state and national historic registers as culturally and technologically significant.
It was 45 years ago this September when the Space Shuttle Enterprise rolled out of its assembly building at Rockwell International Space Division’s facility in Palmdale, California. Waiting outside were a crowd of VIPs that included six cast members of the Star Trek crew, and series creator Gene Roddenberry.
NASA had initially suggested naming the prototype Constitution and even wanted to unveil the spacecraft on September 17 – Constitution Day. But as NASA’s plans became publicly known, thousands of fans of Star Trek – which had gone off the air several years earlier in 1969 – began a write-in campaign to the White House urging President Gerald Ford to name the orbiter Enterprise in honor of the fictional starship.
“I’m a little partial to the name Enterprise,” said Gerald Ford, noting that he had served in the Pacific during World War II aboard a U.S. Navy ship that serviced an aircraft carrier of that name. The Star Trek write-in campaign apparently influenced President Ford and the show’s fans are generally credited as being the driving force behind the shuttle’s name change.
While called Enterprise, the prototype NASA orbiter was formally known as Orbiter Vehicle-101 or OV-101, and represented the culmination of years of research, design, and experimentation. Planning for the Space Shuttle Program had begun in 1968, ten months before Neil Armstrong and Buzz Aldrin set foot on the moon during the Apollo 11 mission. The intent was to develop a reusable and affordable vehicle that could travel to and from space routinely, easily, and affordably.
Unlike typical aviation advancement, the space shuttle was a major technological leap forward. While airplanes tend to slowly evolve over time through constant adjustments based on testing and performance, the systems and design of the shuttle was unprecedented. Space flight capabilities went from disposable rockets and capsules to a reusable cargo space plane in only twenty years; there was no transitional design. As a prototype, Enterprise was largely responsible for making sure these new technologies and concepts worked properly to ensure the safety of the astronauts who would fly aboard the other vehicles.
Two events likely led to the decision to use a rocket/space plane system for the shuttle: the advent of thermal insulation tiles by Lockheed, which made it affordable and convenient to insulate an airplane-like design, and the order by Congress that the next space vehicle meet not only the requirements of NASA but also the U.S. Air Force. One of the biggest requirements of the Air Force was the ability to land at Vandenberg Air Force Base in California so that classified missions could be completed quickly and efficiently. After testing it was determined that the sweeping, triangular-shaped delta wing design would be more stable and would allow for the necessary maneuverability at high speeds that a conventional wing design wouldn’t allow.
Enterprise, the first and only full-scale prototype orbiter vehicle of the space shuttle fleet,was first used during the Approach and Landing Tests, one of the earliest missions of the Space Shuttle Program. The Approach and Landing Tests program saw Enterprise fly in Earth’s atmosphere, doing so thirteen times, five of which saw it separate from the Shuttle Carrier Aircraft to fly and land unaided. The Shuttle Carrier Aircraft is a modified Boeing 747 that is used to transport space shuttle orbiter vehicles in a piggyback-like configuration.
Enterprise was also of paramount importance in planning and preparation at shuttle facilities in Florida and California. In the early days of the Space Shuttle Program, Enterprise was the only completed orbiter vehicle and was therefore the only vehicle capable of ensuring that the facilities were prepared and ready for the first launch. The fit checks, vibration tests, atmospheric flights and landings, and various other development tasks performed on Enterprise enabled Columbia to launch successfully into space during STS-1 on April 12, 1981.
Enterprise was used later in the investigations and procedural revisions following the Challenger and Columbia shuttle accidents. Following the Challenger accident in 1986,Enterprise aided in crew escape tests. Following the Columbia accident in 2003, one of Enterprise’s wing edges and a landing gear door were borrowed for tests related to foam chunks striking an orbiter during launch. Although the loss of two space shuttle orbiters was a devastating loss, Enterprise helped the program return to flight and continue its mission.
In 1983, Enterprise began its role as an ambassador and educational tool. Enterprise was first ferried to Paris, France for the Paris Air Show. The international tour continued on with stops in England, Germany, Italy, and Canada. This tour represents the only time an orbiter has travelled internationally. Upon returning home Enterprise was showcased at the World’s Fair in New Orleans, Louisiana. On November 18, 1985 Enterprise became the property of the Smithsonian National Air and Space Museum.
In June 1987 Enterprise was used for testing landing barriers. The landing barrier is essentially a large net stretched across the runway that helps the orbiter reduce speed when landing. The tests were successful, and the landing barriers were installed at three Transoceanic Abort Landing sites (Moron and Zaragota, both in Spain, and Banjul, Gambia). Although retired, Enterprise continued to aid NASA throughout the 1990s and 2000s to test new systems and technology.
Enterprise was put on public display by the Smithsonian in Washington, D.C. from 2004 to 2012 before being transferred to the Intrepid Sea, Air and Space Museum in Manhattan, where it remains on display.
Accomplishments of Enterprise and the Space Shuttle Program
The Space Shuttle Program is responsible for releasing some of the most significant orbiting telescopes, such as the Hubble Space Telescope, the Compton Gamma Ray Observatory, and the Chandra X-ray Observatory. The shuttles also released many groundbreaking probes and space craft including: the Galileo probe, which explored Jupiter; the Magellan probe, which helped map Venus; and the Ulysses probe, which conducted the first systematic survey of the environment of the Sun.
The biggest achievement of the program was the construction of the International Space Station (ISS). The main purpose of the ISS is to serve as an orbiting laboratory. The station has advanced science and technology in areas ranging from biology and medicine to astronomy and physics. Hundreds of experiments have been conducted in orbit aboard the shuttle and the ISS. Some of them are long term and more publicized, such as the effects of microgravity on the human body. Astronaut John Glenn, who first traveled to space during the Mercury Program in 1962, returned to space in 1998 at the age of 77 as part of an experiment to better understand the effects of microgravity on the elderly. Other experiments are much smaller in scope, such as determining if fish can swim upright and observing seed growth in microgravity.
Leroy Chiao, NASA astronaut on STS-65 (1994), STS-72 (1996), and STS-92 (2000), as well as commander and science officer on International Space Station Expedition 10 (2004-2005), stated that “[The] shuttle, to me, represents a triumph and remains to this day a technological marvel. We learned so much from the program, not only in the advancement of science and international relations, but also from what works and what doesn’t on a reusable vehicle. The lessons learned from shuttle will make future US spacecraft more reliable, safer, and cost effective.”
The space shuttle program was also the first American space program to reflect NASA’s adoption of diverse hiring practices. In the late 1970s NASA became more progressive regarding its astronaut selection process. Test pilots and military personnel were no longer the only recruitment avenue for astronauts. The agency began focusing on scientists and engineers as well as women and minority groups. The space shuttle program provided a platform for NASA’s shift in culture and allowing space to become accessible for everyone in a way that hadn’t previously existed. The first American woman (Sally Ride, 1983), first African American (Guion Bluford, 1983), and first African American woman (Mae Jemison, 1992) flew in space aboard the space shuttle. In addition, many non-US citizens have flow aboard the shuttle, representing a diverse group of people and a high level of cooperation. NASA brought diversity, equity, and inclusion to space exploration via the space shuttle.
“[The space shuttle] will be remembered for being the vehicle that enabled us to get the International Space Station successfully assembled on orbit, but it depends on what your favorite thing is. If you’re a scientist or an astronomer, it will always be remembered as the vehicle that delivered the Hubble Space Telescope, then flew four successful servicing missions capped off by one of the most spectacular flights in the history of the shuttle program, STS-125, when we did five back-to-back-to-back-to-back-to-back space walks and carried out every objective of that flight when no one thought we would be able to finish everything.
You look at other satellites that it deployed: Magellan, Ulysses. You look at the space laboratory that was flown on it, or the space habitation module. The people that it took to space. We now see, when you look at an astronaut crew, it’s usually a rainbow of people—all races, all genders, all nationalities…There are countless things that the space shuttle will mean, just depending on who you are and where you sit.”
– Charles Bolden, NASA Administrator, 2011
Like its fictional namesake, the shuttle Enterprise was the first step of a bold journey further into outer space. It performed a 36-year mission (seven times longer than that of the Star Trek Enterprise) that set the stage for the shuttles Atlantis, Challenger, Columbia, Discovery, and Endeavor and their crews to undertake unprecedented scientific and technological missions in orbit. The pioneering vessel truly has a place in the nation’s history, and State Parks was proud to have gotten it listed to the State and National Registers of Historic Places.
Live Long and Prosper!
All photos credited to NASA unless otherwise noted.
Post by Daniel A. Bagrow, Historic Preservation Program Analyst, State Parks Historic Preservation Office
Twenty-five years ago, as a young Fish and Wildlife Technician with the state Department of Environmental Conservation, I was recruited for an unusual field outing on State parkland in the Hudson Highlands of southeastern New York: a first of its kind, hands-on training to become a certified nuisance rattlesnake responder.
As a responder, I would be on a short list of people willing to safely and legally relocate timber rattlesnakes that had wandered into compromising situations on private property – a win-win for both the homeowner and snake. No such system was in place in the Hudson Valley and, without it, many homeowners took matters into their own hands, often with a shovel or shotgun.
Randy Stechert, a long-time herpetologist and regional rattlesnake expert who has worked through New York, New Jersey, Connecticut and elsewhere, led our small group to a remote rocky clearing in search of Crotalus horridus, the timber rattlesnake. The largest of New York State’s three venomous snake species (the others being the northern copperhead and massasauga rattlesnake), the timber rattlesnake was in trouble, owing to centuries of habitat loss and direct persecution, including a bounty system lasting into the 1970s.
These depredations were so effective the State declared the species Threatened in 1983, a designation requiring conservation measures to keep it from slipping to Endangered status or worse. Currently under New York State Environmental Conservation Law, it is illegal to capture, kill or possess any native snake at any time without a permit, including rattlesnakes.
The mission of that long-ago outing was to familiarize our ragtag group of would-be responders with this species in the flesh. Randy would show us a wild rattlesnake and how to safely handle it, while imparting his wisdom about all things rattlesnake in his booming baritone voice.
And boy did he deliver.
I will never forget the robust, nearly all-black rattlesnake plucked from a huckleberry patch and deposited on the open bedrock just feet in front of me. Most memorable was how easily we could stand beside this now agitated wild animal with little concern about its intentions. It was in a clearly defensive posture, coiled and ready to repel any further attacks from this presumably malevolent band of primates.
In the ensuing decades, and after handling dozens of rattlesnakes in my research and as a nuisance responder, I’ve come to understand them as pacifists at heart. Despite their considerable weaponry – two hypodermic needle-like fangs and potent venom – they really just want to be left alone. In fact, their first response to human presence is to remain motionless, and hope their camouflage shields them from detection. If detected and a retreat is available, such as a rock crevice, they will typically make a rapid exit to safety. But if they feel exposed, vulnerable, and without a means for escape, they quickly switch gears in an attempt to intimidate their aggressor. A cornered rattlesnake coils, inflates to look more girthy, and rapidly vibrates its namesake rattle to audibly back up the message. This menacing version is our popular notion of a rattlesnake but, ironically, is merely a response to the perceived threat posed by us.
Since that indelible first encounter with a wild rattlesnake on State Park land, I have become increasingly entwined with this charismatic species. I’ve rescued them from homeowner’s yards, conducted field surveys for their winter dens, and ultimately took a very deep dive into unraveling the timber rattlesnake’s mating system and reproductive ecology as a graduate student.
Still managed by the DEC, the nuisance rattlesnake response program includes most members of that original group recruited in the mid-1990s. While Randy Stechert continues to host trainings (now done with captive snakes, rather than wild ) in recent years, he has passed the torch to another generation of trainers, including myself here at State Parks.
Where I work at Trailside Museums and Zoo at Bear Mountain State Park , natural resource staff, backcountry rangers and our own zookeepers have been trained using our captive rattlesnakes under this program, expanding Parks’ in-house capacity to respond to nuisance situations at all our locations.
Other conservation measures have been installed as well in recent years. For example, all park development projects are “screened” by location to assess their potential for rattlesnake impacts. When possible, projects sited within snake habitat are scheduled for November to March, when the snakes are less likely to be active and in harm’s way. When this can’t be done, the contractor is required to develop a rattlesnake response plan and have an onsite snake monitor to head off conflicts. In some cases, when habitat loss or direct impacts are considered unacceptable, the project is relocated, reconfigured, or even denied.
The timber rattlesnake has been a survivor, persisting in the rocky uplands of the Hudson Valley, Southern Tier and eastern Adirondacks for at least the last six thousand years. Our past concerted efforts to eliminate it from the landscape were unsuccessful, and good thing. As more species disappear and the fabric of nature unravels, thread by thread, the value of having formidable, wild creatures about us only increases.
State parklands are a critical refuge for this imperiled snake in New York and can remain this way with a little foresight, planning, and, frankly, empathy, on our part. If we can successfully accommodate the long-term survival of the timber rattlesnake, it will bode well for biodiversity overall.
What To Do If You See a Rattlesnake?
If you are on State parkland or elsewhere in the wild, observe the snake from a safe distance (at least six feet), and take a moment to enjoy this majestic animal. If you snap a picture with your cell phone and want to share it with others over social media, it is best to do this without disclosing exact location information. You can either share a screenshot or make sure location services are disabled on your phone. This will keep the location secret from snake poachers attempting to mine online location data. After briefly observing the snake, back away and make a detour around its location to continue your hike.
In a nuisance situation where the snake’s presence is problematic, such as in or near a dwelling or public space, a certified relocation expert can be obtained by calling 911 or the DEC. Please remember: Do not attempt to disturb or capture the snake yourself. Seeking expert assistance in this instance is one way to help New York preserve its biodiversity.
Cover shot – A yellow morph timber rattlesnake blends into the forest floor. All pictures NYS Parks unless otherwise credited.
Threatened in New York State and often misunderstood, the Timber Rattlesnake is an impressive and unique species that is essential for healthy ecosystems. At an average of 3-4 feet in length and described as “stocky,” timber rattlesnakes are the largest venomous snake species in New York. They are easily identified by their broad triangular-shaped head…
Throughout much of New York State earlier this summer, fuzzy caterpillars were rampaging through natural forests and well-kept gardens alike. Maybe you noticed these bristly little critters wobbling along, or even had an itchy rash after touching their mildly stinging hairs!
These crazy caterpillars are Lymantria dispar, which you may have called gypsy moths in the past. Why not just call them gypsy moths? What is really in a name?
This is an exciting time as we wait to hear the new official common name for our moth, Lymantria dispar, but for this blog post we’ll call them L. dispar for short. Currently, the Entomological Society of America has is considering options for new names under the Better Common Names Project, in order to “bar names referencing ethnic or racial groups and names that might stoke fear.”
There is a plethora of fun characteristics for this moth which could apply to a new name. I personally vote for something akin to “Pricklecater,” “Blue-Red Spotted Messworm” or “Itchy Eww Moth.”
Anyways… back to our story.
A native of Europe, L. dispar were accidentally released into the wild in 1869 and have since become “naturalized”in 19 Northeastern states. This means they have shoved their way into local food webs as they munch down on foliage then in turn become a tasty food source for birds, bugs, and other predators.
For the most part, they are active participants in the wonderous world of ecology. They are citizens playing their part in a complex and everchanging ecosystem. A single L. dispar caterpillar can eat about a square meter of plant material during its short lifetime, but one caterpillar doesn’t do too much damage.
The problem is that one female moth can lay more than 1,000 eggs in a single mass, which stick to the sides of trees, and are browish and gummy-looking.
That’s a lot of eggs!
Every 10 to 12 years, the L. dispar population explodes exponentially and hundreds of thousands of tiny caterpillars hatch in the spring. Once hatched, they use a strand of silk to “balloon” away on the wind until they find a newly leafing tree to eat and eat and eat.
To experience these numbers, I’d like you to imagine walking your favorite path in the woods. Shaded from the hot sun, you can hear the gentle pitter-patter of rain sprinkling down through the canopy. How peaceful… There is no better place in all the world on this cloudless day.
“Cloudless day? But isn’t it raining?” you ask.
Oh yes, something is raining down… but it’s not water.
Scientifically known as frass, this tiny spherical poop from thousands of very hungry caterpillars is dropping down onto your head and shoulders, as these little machines diligently convert the lush green leaves overhead into little brown balls of poo.
Not great. Pretty gross.
These baby caterpillars have small, young jaws, and prefer soft new budding leaves until they are old enough to chew tougher vegetation. While the prefer hardwood trees, they will eat more than 300 different plant species when hungry enough, stripping away all foliage until trees and bushes are left embarrassingly naked
This can be a problem.
When deciduous trees like oak, birch and maple are eaten by caterpillars, they usually have enough stored energy to push out another set of leaves before the summer is through. It takes multiple years of defoliation to weaken these trees to the point of death. However evergreen trees cannot bounce back as quickly. Coniferous (evergreen) trees put lots of energy into their tough, thick, needle-like leaves, and will likely die if more than half of their needles are eaten.
Most years the caterpillars are fairly harmless, except during these incredibly destructive outbreaks which reoccur in a slow but disastrous cycle. Due to this pattern, L. dispar are considered cyclical pests.
In the adult stage L. dispar moths are not destructive at all, as they do not eat anything (no digestive system) and only live for a few days. The white fluffy females have pretty wings used for decoration rather than flying, and release a hormone into the air for male moths to find them. Females remain on the sides of trees as the males fly in search of the females’ scent.The female will lay fuzzy egg masses on whatever surface she’s near and the life cycle will begin again.
This is where we can take some control over the situation. By counting the egg masses in the wintertime, we can predict how many L. dispar caterpillars will hatch in the Spring and we can prepare a plan of defense.
Natural Population Controls
While major L. dispar outbreaks can resemble a plague of locusts consuming everything in their path, nature often has a way of correcting imbalances. At low densities, vertebrate predators keep the population in check, but are ineffective at controlling massive numbers of prey. Bird bellies just aren’t big enough!
However, when L. dispar caterpillars are densely packed into one area, viruses and funguses can spread rapidly. These are naturally occurring diseases which are always present in the environment, but only take significant effect when populations are grossly out of control. Researchers have identified one virus specialized to L. dispar which kills 90 percent of infected caterpillars. This virus has since been converted into an effective treatment which brings the population down to healthy levels.
This natural method of population control is the preferred way to control the situation since it doesn’t harm any other species. However, this treatment must occur very soon after the caterpillars hatch, otherwise the damage will already be done.
These last few months we’ve seen many caterpillars eating their way through New York, and next year could be even worse in some places… or not. It all depends how well nature’s natural defenses have worked.
Measures are being taken at State Parks to perform egg mass surveys to try and predict next year’s population and prepare for any treatments accordingly. Let’s not repeat the summer of 1981 when 13 million acres of forest were defoliated! Our poor defenseless trees!
Post by Juliet Linzmeier, Student Conservation Association member, Invasive Species Unit, NYS Parks
Cover shot – A L. dispar caterpillar. All shots from NYS Parks.
DISCLAIMER: The following materials have not been updated on the new common name for L. dispar, and refer to this pest as “Gypsy Moth”.