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Eastern New York Field Crops Pest Report, 2002

For 6/10/02:

Alfalfa

Potato Leafhopper: Potato leafhopper (PLH) have already been found in several fields this season. While current infestation levels are low, they can increase rapidly as daily temperatures start to increase. New seedings and short alfalfa are particularly vulnerable to injury by potato leafhopper. Even a new seeding that is resistant to potato leafhopper can be at risk although these varieties can tolerate larger numbers of PLH. An alfalfa variety may be resistant but not immune to potato leafhopper. So, scout all alfalfa fields even the resistant ones.

Ray Kennett (Dutchess and Columbia County) reported finding potato leafhopper in some alfalfa fields (June 5).

Check out our on-line publication, Potato Leafhopper Management in Alfalfa

Alfalfa Weevil: SUNY Cobleskill alfalfa fields were harvested last week and the re-growth this week was 3-4 inches tall. I was finding 1/4 to 1/2 inch long alfalfa weevil larvae in the fields. Alfalfa weevil tip feeding ranged from 0 to 20 % on re-growth in 5 fields (June 5).

Ray Kennett (Dutchess and Columbia County-Summer Assistant) reports some of their alfalfa fields show 75% to 85% tip feeding (June 5).

Jeff Miller (Oneida County) reports finding 10% to 30% tip feeding in 8 alfalfa fields.

Check out our on-line publication, IPM for Alfalfa Weevil. 1.2 Mb pdf file

Beneficial Insects: Aaron Gabriel (Washington County) noticed an adult green lacewing while scouting this week. Adults feed in the evening or night on nectar, pollen, and aphid honeydew. Larvae are very active predators of aphids and other small insects. Adults are light green and long, slender antennae, golden eyes and large, lace-like wings that are 1/2 - 1/3 inch long. Larvae, also known as Antlions, look like a little green-gray alligator. Antlions have sickle-shaped jaws that penetrate their prey and inject a paralyzing venom. Lacewing larvae then feed on their captured prey. The larvae will reach about a 1/2 inch long before they pupate.

For more information on the Common Green Lacewing, check out our on-line publication.

Grass & Pasture

General: Grasses at the SUNY Cobleskill were harvested last week (June 5th).\

Slugs: Aaron Gabriel (Washington County) reports finding many slugs in a grass field. Slugs can be a minor problem in cool wet springs like we have been having this year. As Aaron states, slugs do windowing type damage (leaf tissue eaten with one clear layer of cells left, that looks like a window), and leave a slime trail (a shiny trail near its feeding damage).

For more information on SLUGS, check out the on-line publication.

Field Corn

General: Field corn at the SUNY Cobleskill farm has emerged (June 5).

Black Cutworm: Ray Kennett (Dutchess and Columbia County) reports finding 1% to 3% cutworm damage in a few cornfields (June 5). Black Cutworm larvae vary in color from light gray to black with an indistinct yellow stripe down their back and a pale brown head. Larvae have a shiny appearance with coarse granules present over their body. During the day larvae burrow into the soil next to the corn plant. Symptoms of damage are leaf feeding, irregular holes in stem, notched and cut plants. The threshold for black cutworm damage is when 5% or more of the plants have been cut and larvae are still small (<1/2 inch).

For more information on Black Cutworm in Field Corn, check out our on-line publication (912k pdf file).

Have you seen fireflies? Fireflies begin to be seen about the time corn rootworm eggs hatch. Fireflies were sighted in Ithaca (Tompkins County) last week.

Keep on Scouting!