Scouting time
These aphids thrive at cool temperatures, are the last aphid to remain active in the fall and are the first aphid to be active in the spring.
Sampling method
Direct feeding damage to wheat does not result in visible symptoms, but populations of 50 or more per tiller at the boot to heading stage may affect yield and grain quality. Heavy populations in the spring may roll up the flag leaf into a corkscrew shape that can trap the awns, resulting in “fish-hooked” heads. Estimate the population based on a sample of 25 to 50 randomly selected tillers.
Thresholds
50 or more per tiller at the boot to heading stage may affect yield and grain quality. If treatment is elected, choose products broadly labeled for aphid control on wheat. This aphid is also the primary vector of barley yellow dwarf virus (BYDV). Infections that occur in fall while plants are still
small are the most damaging to yield. Conventional sprays usually are not effective in reducing virus incidence; Imidacloprid and thiamethoxam are effective at controlling aphids but have not yet proven to reduce the incidence of BYDV.
Chemical control
Imidacloprid and thiamethoxam
Non-chemical controls
None listed.
Content authors
Disclaimers
This content may not be suitable for states other than Kansas.
