Scouting time
Look for aphids in the whorl of plants in the vegetative growth stage. Populations usually decline rapidly after the head begins to emerge.
Sampling method
Visually inspect sorghum whorls.
Thresholds
Control is rarely necessary and should only be considered if infestations persist after heads have emerged.
Chemical control
|
Insecticide |
Rate |
|
Alpha-cypermethrin (Fastac EC) |
0.02 to 0.025 lb. a.i./acre (3.2 to 3.9 fl. oz./acre) |
|
Chlorpyrifos (numerous products) |
Check label, but generally 0.5 to 1 pint/acre. |
|
Chlorpyrifos plus gamma-cyhalothrin (Cobalt) |
7 to 13 fl. oz. of product/acre |
|
Chlorpyrifos plus zeta-cypermethrin (Stallion) |
9.25 to 11.75 fl. oz./acre |
Non-chemical controls
Mild infestations of corn leaf aphid are generally considered to be beneficial because they attract and support populations of aphid natural enemies that later contribute to greenbug control.
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Disclaimers
This content may not be appropriate for states other than Kansas.