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Showing posts from August, 2015

Aphids in corn: The dilemma of post-pollination infestations

Bruce Potter, IPM Specialist, and Ken Ostlie, Extension Entomologist
As agriculturalists re-enter corn fields to scout corn rootworm beetle populations and begin to estimate yield potential, they often find some unwelcome aphid visitors. Heavy infestations on ears and adjacent leaves can grab your attention and trigger the “Should I spray question?” The crop protection urge may be strong with the corn crop we have this year; let’s review what’s known about aphids in corn before you make that spray or don’t spray decision.

What to consider when treating a soybean field more than once for soybean aphid

by Robert Koch (Extension Entomologist), Bruce Potter (IPM Specialist), Ian MacRae (Extension Entomologist), and Ken Ostlie (Extension Entomologist)

Soybean aphid populations in many areas of Minnesota are increasing. This year, there are a number of factors making population development and management less predictable than in the previous couple of years:
Late summer dispersal of soybean aphids is currently occurring, bringing high numbers of winged aphids to colonize fields; sometimes those that were previously treated. Forecasted weather conditions for the upcoming week look favorable for aphid population growth. A number of fields in southwestern Minnesota have reported unexplained failure (poor performance) of recent insecticide treatments and will require additional applications to control existing populations. All of these factors point to the importance of weekly scouting for soybean aphids and treating when populations reach the threshold of 250 aphids per plant wh…