Soybean Loopers - September 2011
[Video shows various pictures of soybean fields with specialists or agents in fields.]
[Title Slide – Soybean Loopers. Your Arkansas Soybean Podcast. Presented by University of Arkansas Division of Agriculture Research and Extension U of A System, Arkansas Soybean Promotion Board.]
[Pictures showing loopers and soybean leaves in a net and other various looper pictures.] I’m Scott Akin, extension entomologist with the University of Arkansas Cooperative Extension Service and today I am going to talk to about the “looper complex.”
[Dr. Scott Akin, U of A Div. of Agri, Extension Entomologist standing in a soybean field.] The looper complex, like other insects in soybeans, tend to feed primarily on the leaves. Which of course, the term we call that is just “defoliation.”
[Slide – Pictures of loopers in a net. The action threshold for treatment is 25% in soybeans.] One important thing to keep in mind about loopers and this is typically the time of year that loopers will start to come into play is that the smaller the insect, the smaller the larva, the less feeding that it does per unit of time relative to a larger caterpillar. [Close-up picture of a looper on a leaf.] Bottom line, is if you come up on a population in the field of small caterpillars and there is not much defoliation in the field, I want to caution you to NOT come back a week later and then check to see what the field looks like because the rate of feeding increases over time as the insect or the larva grows larger.
[Picture of a looper on a leaf with holes.] As far as insecticides for treatment of soybean loopers, I urge you to stay away from pyrethroids by themselves. The lambda-cy’s, the Brigades®, any of the other bifenthrin products, those are very risky and will often flare soybean loopers. [Slide – Top recommended products for soybean loopers – 4-6 ounces Intrepid®, 2 ounces Belt®, 6-8 ounces Steward®] The product of choice for soybean loopers, if you are getting close to that 25 percent threshold during reproductive stages, 4 to 6 ounces of Intrepid®, 2 ounces of Belt® or 6 to 8 ounces of Steward®. Those are really the three top choice products that we recommend for soybean loopers.
[Narrator] Your Arkansas Soybean Podcast is a production of the University of Arkansas Division of Agriculture, and was funded impart by the Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your local county extension office.
[Title slide – Your Arkansas Soybean Podcast. Video shows various pictures of soybean fields with specialists or agents in fields. U of A Division of Agriculture Research and Extension University of Arkansas System, Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your county extension office or go to www.uaex.edu. Your Arkansas Soybean Podcast.]