It seems like a long time since the last episode and that's because it was! Matt and Erin are back to talk about pest updates in Iowa. Drought stress throughout much of the state has been ideal for twospotted spider mite. Erin reports Some injury has been observed in corn and soybean this summer. Treatments are going on now throughout some southern Iowa counties. In addition, soybean aphid continues to be an erratic pest. Some populations are building up in northern Iowa counties, but most fields are not reaching the economic threshold in July. Matt elaborates about high numbers of Japanese beetle and they talk about the use of pheromone traps as a management tool. Finally, Matt talks about a new Science research paper that has inconsistent data on the effect of neonicotinoid seed treatments on wild and managed bees in Europe.
Matt and Erin took May off from podcasting, but had a lot to talk about in the third episode of season 8. The cool, wet spring resulted in delayed planting for some; however, many of their research plots went in the ground this week. There have been a number of black cutworm and true armyworm reports throughout Iowa the last two weeks. Treatment decisions are based on plant growth stage, pest density and injury. Read more about their biology and management in ICM News articles:
Erin also reported common stalk borer is moving to corn and soybean, particularly in the southern counties. Fields with stalk borer injury should scout now. Also, some fields are experiencing slugs - injury is most noticeable in fields with high residue. Finally, Matt and Erin got a USDA Challenge Grant and are looking for an extension program specialist that can work with farmers, beekeepers and conservationists. Find the job description here.
Ashley Dean, new graduate student, helping plant her soybean research project at the NW Research Farm near Sutherland. Photo by Greg VanNostrand.
Black cutworm. Photo by Adam Sisson.