Drs. Hodgson and O'Neal return with weekly updates on the insect pests attacking soybeans. This week we discuss the first reports of soybean aphids in Iowa, the growing risk for spider mite outbreaks, and an alarming change in the emergence of Japanese beetles.
(S4:E1) The soybean aphid podcast is back for 2012!
New publication about where to find aphid resistant soybeans
Farmers interested in purchasing aphid resistant soybeans can learn more in a new publication from ISU.
Seed companies were surveyed in the fall of 2011 regarding the availability of aphid resistant varieties. Good news: aphid resistant soybean seed is available. Learn about what companies are selling these through this 4-page summary. Download it for free here.
(NOTE-This document was edited on March 29, 2012. In the original an NK Brand seed was miss-labelled S21-EF. It was corrected to NK Brand S21-Q3.)
(S3:E10) Bringing it home: wrapping up a season of aphids in soybeans
As soybeans reach the late reproductive stages the need to manage aphids decreases. However, aphids persist in soybean fields around the midwest. We discuss a couple factors that should be considered when applying insecticides this late in the year. Also, we re-count the spread of Japanese beetles in Iowa as a new herbivore of soybeans.
(S3:E9) Rounding third: covering the bases with late season aphid management advice
The growing season is coming to an end and aphids still persist in some areas. We discuss how insecticides may cause problems with spider mites, especially with the use of pyrethroid-based insecticides. Also look for updates regarding bean leaf beetle threshold calculator in the ICM newsletter next week. Thanks to Mike McCarville.
(S3:E8) Pull the trigger?
Aphid populations continue to increase in Iowa. We discuss their trajectory and when/if insecticides will be needed. Also, new publications from Iowa State University are available for the soybean aphid and the brown marmorated stink bug. To purchase the id guide for stink bugs or the new soybean aphid field guide visit the ISU extension publication store (www.extension.iastate.edu/store). To learn where the brown marmorated stink bug is in Iowa visit www.ncipmpipe.org.
(S3:E7) Tora tora tora
Soybean aphid populations reach threshold in Iowa and japanese beetles are becoming an increasing problem for both soybean and corn. In this episode we discuss both of these pests and the need to scout now to determine the need for an insecticide. To learn more about Japanese beetles see Dr. Hodgson's latest article in the Integrated Crop Management newsletter (http://www.extension.iastate.edu/CropNews/2011/0722hodgson.htm).
(S3:E6) When to spray for aphids
We discuss the likelihood that aphid outbreaks will occur and when to spray aphid populations. Some agri-businesses are suggesting that aphids be sprayed when populations are lower than 250 aphids per plant. We discuss the value of such lower thresholds, as well as ways to detect other invasive insect pests of soybeans.
(S3:E5) Aphid populations increase! No lie.
(S3:E4) Soybean aphids remain at low levels
(S3:E3) Aphids establish a foothold
Drs. O'Neal and Hodgson summarize reports from around the midwest and Iowa about the soybean aphid. Despite the lack of aphids in the fall, evidence so far is that they survived and are beginning to build up in the northern parts of Iowa. Numbers are still very low and do not require insecticides, but we compare 2011 to previous growing season.