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Eastern New York Field Crops Pest Report, 2002

For 6/17/02:

Alfalfa

Alfalfa Weevil: SUNY Cobleskill alfalfa fields were 3-12 inches tall. I was finding1/4 to 3/4-inch long alfalfa weevil larvae in the fields. Alfalfa weevil tip feeding ranged from 10 to 48 percent on re-growth in 12 fields (June 13).

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

Potato Leafhopper: I found low to moderate levels of potato leafhopper in 12 alfalfa fields at the SUNY Cobleskill farm this week. One new seeding of alfalfa was about 1/2 way to the action threshold.

Raymond Kennett (Dutchess and Columbia County) reports finding a few potato leafhoppers in alfalfa fields (June 12).

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

Leptosphaerulina leaf spot: At the SUNY Cobleskill farm I found Leptosphaerulina leaf spot in many fields. The disease appears as small, black spots and either remain small or enlarge to lesions with light brown-to-tan centers, darker brown borders, and a yellowed "halo." The mechanism of the fugal spores to transfer from plant to plant is splashing from rain (June 14).

Grass & Pasture

True Armyworm: Lisa Fields, (Schoharie County) and Kevin Ganoe (Chenango, Fulton, Herkimer, Montgomery and Otsego Counties) report true armyworm moth trap counts are up slightly from last week at Canajoharie and St. Johnsville, respectively.

Mystery Larvae: Attached are photographs of larvae that were found in a hay field.
What kind of insect is it and are they a problem for grass? The answer will be in next week's pest report.

Field Corn

General: Soil crusting reduced the emergence of corn at the SUNY Cobleskill farm. A few seedlings dug out from under the 1/2 inch soil layer exhibited the tell tale twisted and contorted appearance associated with a seedling struggling to break through a hard crust (June 14)

True Armyworm: Tom Kilcer (Capital District) reports cornfields over threshold for armyworm. The corn was planted into a cover crop of rye. The rye was treated with herbicide died and the armyworm moved over to "greener pastures" and switched to the corn (June 13). The Action Threshold for armyworm on field corn is 3 larvae/plant, most of the plants showing damage and larvae are less than 1.25 inches. The armyworms were found in the leaf whorl or under litter on the soil surface.

Question: So what is the best thing about the 2001 Armyworm outbreak?
See end of newsletter for one possibility!

Black Cutworm: Aaron Gabriel, (Washington County) reports finding cutworm in field corn (June 12).

Raymond Kennett, (Dutchess and Columbia County) reports patches of cutworm damage in a few cornfields (June 12).

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

Small Grains

Powdery mildew: Jeff Miller (Oneida County) reports a limited amount of powdery mildew in soft white winter wheat. The mildew was on the stem at the base of the plant. There was no infection of the flag leaves (June 12).

A picture of powdery mildew.

Cereal Leaf Beetle: Jeff Miller (Oneida County) reports observing 1/4 inch long small black slug-like larvae of the cereal leaf beetle in soft white winter wheat. Eggs can be found on the upper surface of the leaves near the midrib. Eggs are elongate, yellow to brown about 1/16 inch long, and are laid in chains of two or three. The adults are 3/16 inch long with metallic bluish-black head and wing covers. Cereal leaf beetle is more of a problem in oats but can occasionally reach threshold levels in wheat.

Have a good week!

Answer to armyworm question: There are many more people scouting their field crops this year. YA!