Cowpea Aphid (Kansas Alfalfa)

Content authors
R. Jeff Whitworth, Ph.D., Associate Professor J.P. Michaud, Ph.D., Associate Professor Holly N. Schwarting, Ph.D., Research Associate Department of Entomology
Kansas State University Agricultural Experiment Station and Cooperative Extension Service MF809
State
Kansas
Target pest
Cowpea Aphid
Scouting time

These large, dark aphids generally feed near the tips of infested stems and have been sporadically reported from alfalfa fields since 1999. Damage is similar to that caused by the pea aphid, and thresholds are likely to be comparable. Significant populations developed in 2009 and 2012.

Sampling method

None listed.

Thresholds

None listed. 

Non-chemical controls

None listed. 

Disclaimers

This content may not be suitable for states other than Kansas.

Chemical control

Insecticide

 Rate

Insecticide

 0.014 to 0.025 lb. a.i./acre (2.2 to 3.8 fl. oz./acre)

Alpha-cypermethrin (Fastac EC)

 0.022 lb. a.i./acre (2.8 fl. oz./acre)

Beta-cyfluthrin (Baythroid XL)

 Check label, but generally 1 to 2 pints/acre

 

Crop type
Alfalfa