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Eastern New York Field Crops Pest Report, 2002
General: Alfalfa at the SUNY Cobleskill farm was harvested this week (May 30).
Potato Leafhopper:Aaron Gabriel (Washington County) reports finding potato leafhopper in alfalfa. One field was about 50% of the action threshold. As Aaron suggests, new seedings and short alfalfa are more susceptible to potato leafhoppers than tall alfalfa. Remember to check all alfalfa fields on a weekly basis. Potato leafhopper populations can increase rapidly as the weather gets warmer (May 29).
Jonathan Wisbeski (Orange County) reports finding potato leafhopper in some alfalfa fields (May 29).
Check out our on-line publication, Potato Leafhopper Management in Alfalfa
Alfalfa Weevil: While SUNY Cobleskill alfalfa fields were harvested this week, I could still find several 1/4 to 1/2 inch long alfalfa weevil larvae in the fields. Watch these kinds of fields closely because the small larvae will continue to feed on the alfalfa re-growth. The action threshold for alfalfa weevil after the 1st cutting is 50% of the new buds showing feeding and small larvae are still present (May 30).
Kathryn Chabarek (Dutchess and Columbia County) reports some of the alfalfa fields that have not been harvested show 85% tip feeding (May 29)
Jeff Miller (Oneida County) reports 10% to 18% tip feeding in six alfalfa
fields (May 28).
Check out our on-line publication, IPM for Alfalfa Weevil. 1.2 Mb pdf file
Grass & Pasture
General: Grasses at the SUNY Cobleskill were harvested this week (May 30).
True Armyworm: Lisa Fields, (Schoharie County) and Kevin Ganoe (Chenango, Fulton, Herkimer, Montgomery and Otsego Counties) report very low armyworm moth counts this season.
Fall Armyworm: Lisa Fields, (Schoharie County) is starting to monitor fall armyworm this week. Adult fall armyworm moths have a wingspan of about 1.75 inches. The hind wings are white; the front wings are dark gray, mottled with lighter and darker splotches. Each forewing has a noticeable whitish spot near the extreme tip. Adults are active at night. Larvae are green, brown, or black about 1/8 inch to 1.5 inches long and have a dark head capsule usually marked with a pale, but distinct, inverted "Y." Along each side of its body is a longitudinal, black stripe, and along the middle of its back is a wider, yellowish-gray stripe with four black dots on each segment. Larvae are active at night, but can be seen feeding on overcast days. Larvae will hide under the canopy of the grass during the day.
Aphids: Peter Carey (Sullivan County) reports that a hay field with some clover and dandelions had many aphids. The aphid species are not known at this time. Aphids normally do not cause damage to grasses in New York (May 30).
General: Field corn at the SUNY Cobleskill farm has not yet emerged (May 30).
Kathryn Chabarek (Dutchess and Columbia County) reports that field corn is at the 3rd to 5th leaf stage.
Have a great weekend!