Insecticides for Corn Leaf Aphid Control in Field Corn

Updated October 20, 2003 by Robert Wright

Economic Thresholds (Purdue University)
Number of Days Before Tasseling	Crop Condition	Number of Aphids Per Plant
21	Normal	15
21	Stressed	10
14	Normal	30
14	Stressed	15
During pollen-shed, aphids may interfere with pollen-shed if they are abundant on the tassels due to their secretions of sticky honeydew. If greater than 50% of the tassels are covered with aphids and their honeydew prior to 50% completion of pollination, control may be needed.

This list is not inclusive. See http://www.greenbook.net or other resources for additional registrations.
This information is presented in abbreviated form. Be sure to consult the label for additional information and restrictions.

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R =Restricted-Use Product

	Product Name	Common Name	Rate (Formulation/Acre)	Restrictions/Comments
	Dimethoate 4EC	dimethoate	2/3 - 1 pint	Do not apply during pollen-shed if bees are present.
R	Lorsban 4E	chlorpyrifos	1 - 2 pints
	Malathion 57EC	malathion	1½ pints
R	Penncap-M	methyl parathion	2 - 3 pints	Do not apply during pollen-shed if bees are present.