NEW YORK STATE - As April 2026 brings the first real warmth to the Empire State, New York's diverse ecosystems—from the skyscrapers of Manhattan to the peaks of the Adirondacks—are seeing a surge in biological activity. The Department of Environmental Conservation (DEC) and the Department of Health have issued several high-priority alerts this month.
A mild winter has accelerated the "wake-up" call for many pests. Here is what is on the move in New York right now.
1. Spotted Lanternfly: The "Mud Smear" Inspection
New York is in a high-stakes containment phase. While the Spotted Lanternfly (SLF) is well-established in New York City and the Hudson Valley, new detections in the Finger Lakes and Lake Erie regions have officials worried about the state’s $300 million wine and grape industry.
- The Threat: These insects feed on sap from over 65 plant species, including hops, maples, and grapes. Their sticky "honeydew" waste coats leaves and promotes a black mold that can kill entire vineyards.
- What to Look For Now: April is the critical month for spotting egg masses before they hatch. Look for gray, cracked mud-like patches on tree trunks, rusted metal, or the undersides of outdoor furniture.
- Action Plan: If you see an egg mass, scrape it into a bag of rubbing alcohol. If you find the small, black-and-white nymphs (which hatch in late April), report the sighting via the New York State Department of Agriculture website immediately.
2. The "Spring Surge" of Ticks and Mosquitoes
State health officials have noted a "rollercoaster" spring in 2026. While the winter was mild, April's fluctuating temperatures have led to an early and aggressive start for biting insects.
- Tick Warning: Black-legged (Deer) ticks have been active since early March this year. Experts warn that nymphal ticks (the size of a poppy seed) may have a higher prevalence of Lyme disease in 2026.
- Mosquito Activity: As of April 13, 2026, mosquito control activities—including aerial larvicide treatments—are officially underway across the state.
- Public Health Alert: While West Nile Virus is the primary concern, the Jamestown Canyon Virus was identified in New York mosquitoes in late 2025. This spring, surveillance has been increased to monitor for human cases. Tip over any standing water in your yard every 5 days to prevent breeding.
3. Venomous Snakes: The Big Three Emergence
New York is home to three venomous snake species. As temperatures consistently hit the 60°F mark this month, they are emerging from their dens to bask in the sun.
- The Timber Rattlesnake is found in the Hudson Valley, Catskills, and Lake George regions. They are currently "lethargic" but will be moving toward rocky ledges to gestate. They are a protected species; it is illegal to kill or collect them.
- The Copperhead Common in the lower Hudson Valley and downstate. They are masters of camouflage in dead leaves. Be extra cautious when clearing yard debris or moving woodpiles this month.
- The Eastern Massasauga, New York’s rarest rattlesnake, is found only in two specific wetland locations in Western and Central New York. They are emerging from their "swamp burrows" (often crayfish holes) late this month.
Safety Rule: If you see a snake, give it at least 6 feet of space. Most bites occur when a person attempts to move or kill the snake.
4. Southern Pine Beetle: The Fire Risk
The DEC has issued a specific alert for Long Island and the Hudson Valley regarding the Southern Pine Beetle. Thousands of pitch pines have died recently due to this invasive bark beetle.
- The Danger: Beyond the ecological loss, the massive buildup of dead timber has increased the wildfire risk for the 2026 season.
- What to Watch For: Look for "pitch tubes" (clumps of sap that look like popcorn) on the bark of pine trees. Controlled burns of "slash piles" are occurring this month in places like Napeague State Park to manage the fuel load.
5. Bear Awareness in Residential Areas
The DEC issued a reminder on April 18, 2026, that black bears are actively seeking food after leaving their winter dens.
- The Conflict: With natural food sources still scarce in early spring, bears are being drawn into backyards by bird feeders and garbage.
- The Policy: "A fed bear is a dead bear." Residents are urged to take down bird feeders immediately and store garbage cans in a garage or basement until the morning of pickup.
Checklist for New Yorkers
- Inspect Your Vehicle: Before traveling out of NYC or the Hudson Valley, check for Spotted Lanternfly egg masses.
- Tick Check: Perform a full-body check after hiking or gardening; 2026 is a high-risk year for Lyme disease.
- Water Management: Check gutters and buckets weekly for mosquito larvae.
- Bear-Proofing: Secure all food attractants to prevent dangerous bear encounters in your neighborhood.
