However, scab remains a research focal point, even as University of Minnesota crop scientists keep a close eye on higher levels of aphids and rust in small grains this year. Minn. Much of the research is supported in part by the Minnesota Wheat Checkoff, administered by the Minnesota Wheat Research and Promotion Council.
Infestations can be sporadic.
There's no telling where you are going to get them. One field may be colonized, while the field next door may be clean. Some later-planted fields may still be vulnerable to aphids, but scout and treat fields only if warranted. Aphid treatment is optimal when wheat is in the flag leaf stage. Parasitic insects, rain, and a fungal disease that kills aphids will help reduce aphid populations as the growing season progresses.