Russian wheat aphid (Kansas Wheat)

Scouting time

Risk of yield loss is highest when infestations develop in early spring. Fortunately in Kansas, climatic conditions and biological control by predators, especially lady beetles, are normally quite effective in keeping them below damaging levels. Significant infestations in Kansas have generally been limited to the counties near the Colorado border.


Persistent high populations of Russian wheat aphids can lead to serious crop losses. The recommended threshold for treatment varies with the time of year and the expected yield. Populations that develop soon after the crop emerges in early fall can be damaging but are unusual in Kansas. At this time, a 20 to 30 percent infestation of plants may warrant treatment. In spring if wheat has yield potential of at least 20 bushels per acre, treatment should be considered when 20 percent of tillers show symptoms and most have live aphids. In fields with a yield potential of 40 bushels or more, it may be economical to treat when as few as 10 percent of tillers are infested. When 30 to 40 percent of primary tillers are infested between flowering and the soft-dough stage, treatment may be advisable, but infestations confined to late-developing secondary tillers are less damaging to yield.

Chemical control

Russian Wheat Aphid Management Options



Alpha-cypermethrin (Fastac EC)

 3.2 to 3.9 fl. oz./acre

Beta-cyfluthrin (Baythroid XL)

 0.014 to 0.019 lb. a.i./acre (1.8 to 2.4 fl. oz.)

Chlorpyrifos (Lorsban-4E)

 Check label, but generally 0.5 to 1 pint/acre

Chlorpyrifos plus gamma-cyhalothrin (Cobalt Advanced)

 6 to 13 fl. oz./acre

Chlorpyrifos plus zeta-cypermethrin (Stallion)

 9.25 to 11.75 fl. oz./acre

Dimethoate (Dimate and others, formerly Cygon)

 0.25 to 0.375 lb. a.i./acre

Endosulfan (Thiodan 3EC)

 0.75 lb. a.i./acre

Gamma-cyhalothrin (Proaxis)

 0.01 to 0.015 lb. a.i./acre (2.56 to 3.84 fl. oz.)

Lambda-cyhalothrin (Numerous products)

 0.02 to 0.03 lb. a.i./acre

Sulfoxaflor (Transform WG)

 0.75 to 1.5 fl. oz./acre (0.023 Ð 0.047 lb ai/acre)

Zeta-cypermethrin (Mustang MAXX, etc.)

 0.02 to 0.025 lb. a.i./acre (3.2 to 4.0 fl. oz.)


Non-chemical controls

None listed.

Content authors


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