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Eastern New York Field Crops Pest Report, 2003
Note: Any Eastern New York Extension Educator who wants to contribute their pest scouting activities to the Eastern New York Field Crops Pest Report, you are more than welcome to join in the fun.
Alfalfa at the SUNY Cobleskill farm was 6 to 8 inches tall (May 1) and looked to be in very good condition.
Alfalfa Weevil Creeps into Fields, but No Eggs to be Found! Last week (May 1) I discovered a few adult alfalfa weevils. I looked far and wide for eggs in stems of alfalfa and did not find any. Do you know what the eggs look like when the adult female weevil lays them in a stem? Weevils chew a hole and lay up to 25 eggs at one time into an alfalfa stem. Each female weevil can lay from 500 to 2000 eggs during the growing season. When eggs are first deposited into the stem they are yellow and then turn darker as they develop. First instar larvae hatch from eggs at about 280 growing degree-days (48F base temp). Here is a website with great pictures of alfalfa weevil egg development:
Check out our on-line publication,
for Alfalfa Weevil. 1.2 Mb pdf file
Corn fields at the SUNY Cobleskill farm were still a little too wet to prepare (May 1st).
When do weeds wakeup in the spring?
Do you know the number of growing degree-days in your region today?
For more information, check out our on-line publication, Weeds in Corn-Management Guide, 1Mb pdf file
Larvae are smooth cylindrical pale green (when young) to brownish.
Mature larvae are smooth and marked with two orange, white-bordered strips on each side.
Larvae range in size from 1/8 inch to 1.5 inches when fully grown.
of True Armyworm
See next week's pest report for the answer!