This podcast episode focuses on a few recent pest updates, like soybean aphid, twospotted spider mites, and a mix of defoliators. Matt talks about spider mite activity in some of his research plots and also in fields near Brookings, SD. Erin notes soybean aphid activity is down throughout Iowa and they both revisit the economic threshold for this common pest. To read more information about why the economic threshold for soybean aphid remains consistently at 250 per plant, read this webpage co-authored by many university entomologists. Finally, Matt shares a research update on the release of parasitic wasps that like to feed on soybean aphid.
After a break, Matt and Erin get together for episode 3 in 2019. Erin mentioned a flash drought is expected this week if high temperatures continue throughout Iowa. This could have implications for pest management - slowing down soybean aphid but perhaps accelerating twospotted spider mite. Erin also highlights current pest activity in field crops, including corn rootworm and Japanese beetle. But they spent some time talking about the newest pest in Iowa, soybean gall midge. So many unanswered questions, but it appears this will be an economic soybean pest. Matt comes back to an older podcast episode where they reviewed the cancellation of sulfoxaflor insecticide. It was recently registered (again) by the EPA and will be labeled in soybean. This insecticide offers an alternative mode of action for soybean aphid. Finally, Matt brings up a F.I.T. that is about isopods.