In this podcast, Matt and Erin talk about recent aphid developments in northern Iowa and southern Minnesota. Soybean aphid numbers are steadily climbing and aphids in corn are making a rare appearance this year. Foliar insecticides are starting to happen to protect yield. Also, Matt recently attended a USDA Corn Climate Change grant meeting and summarizes recent applied and modeling data for future corn production.
“Hanging around, nothing to do but frown, Rainy days and Mondays always get me down.” Karen Carpenter sang about this deadly combination and it’s effect on her emotions. Now, Matt and Erin pile on with a list of insect pests that are active in the state of Iowa. Thankfully, it is not all bad news as we review the biology and pest status of spider mites, soybean aphids and a mix of caterpillar species. We discuss how the weather can help determine if a spider mite outbreak is likely and some tips for dealing with one if it occurs. Matt reveals an upcoming gig in which he will speak at a “Conservation Biological Control Short Course” hosted by the Xerces Society for invertebrate conservation. This all-day event is on 21 August at the ISU Field Extension Education Lab. To learn more visit the website: http://conta.cc/1g9yZqI. Email us your questions at email@example.com and firstname.lastname@example.org.
In this episode, Matt and Erin start by talking about foliar insecticide sprays for soybean aphid. Erin has a large efficacy evaluation program and screens many different products every year. She publishes the results in a Yellow Book (see previous editions here: http://www.ent.iastate.edu/soybeanresearch/content/extension). Then Matt talks a bit about corn rootworm biology and why that might be important in Iowa soybean.
If a soybean aphids could talk, I would imagine them screaming, " Stop touching me!". Many Iowan fields are infested with soybean aphid this summer. Erin and Matt talk about what to do when these increasing populations happen late in the season. A short conversation about aphids in corn also happens. Finally, they get diverted and talk about winged aphid formation based on several cues, like touching and predators.
In this episode, Matt and Erin talk about end-of-season soybean aphid populations in Iowa. Matt also shares results from a recent CCA poll from ISU Sociologist J. Arbuckle. He summarizes perceptions about emerging concerns in agriculture.
The podcast took a break while Matt was on vacation and Erin was on the extension circuit. But they're back and talking about recent pest activity in Iowa. First, Erin shares updates about treating for soybean aphid in northern Iowa. Populations were erratic, as usual, and some fields exceeded threshold in early- to mid-August. A few people noticed poor performance of bifenthrin, a pyrethroid, for soybean aphid. This isn't a huge surprise, given there are pyrethroid-resistant populations in southwestern and southcentral Minnesota in 2015 and 2016. It is important to assess insecticide efficacy and determine potential issues with soybean aphid. In general, soybean are approaching mid- to full seed set throughout Iowa and yield responses are not consistent when applied after full seed set.
In addition, Erin has noted some corn fields with abundant aphid populations. Some fields exceeded 1,000s per plant and were treated with aerial applications last week and this week. Economic thresholds for these pests are not well defined, but Erin has an ICM News article to take into consideration.
Matt and Erin will be at the 2016 Farm Progress Show near Boone, Iowa on August 30. Erin will be at the ISU Event Tent in the morning and have a presentation at 10am. Matt will be there in the afternoon - so stop by and see them!