Mid-Season Insect Report - July 2013
[Glenn Studebaker, Ph.D., Extension Entomologist, University of Arkansas Division of Agriculture Northeast Research and Extension Center (NEREC). U of A University of Arkansas Division of Agriculture Research and Extension University of Arkansas System, Arkansas Soybean Promotion Board.]
Hello, I’m Glenn Studebaker, Extension Entomologist with the University of Arkansas Cooperative Extension Service, located here at the Northeast Research and Extension Center which is in northeast Arkansas at Keiser. [Video shows Northeast Research and Extension Center and sign as well as a soybean field.]
I’m going to talk to you today about mid-season insects and soybeans. Pretty much up to this point we’ve been able to kind of slide by without checking our soybean fields every week, but now we’re heading into that time period in mid-season and all through the rest of the season, when insect pressure gets to be pretty heavy. We’ve already seen stink bugs come into some of our fields earlier. Earlier than normal and in higher numbers than normal this year, so I expect that will be a big problem through the rest of the season. [Video shows soybean fields and pheromone traps mounted in fields.]
We’re also seeing pretty good numbers of corn earworm showing up in our pheromone traps. We trap the adults this time of year, every week to monitor populations. We’re seeing pretty high numbers. We’re seeing a flight at this time and they are one of the No. 1 pests in soybeans. Particularly now that the beans are moving along in the reproductive phases, which means they are flowering and starting to put on pods. That’s what stinkbugs and corn earworms like to feed on. That’s what really gets into the growers’ pocketbook when those start to eat the pods off of the plants.
I would recommend that fields be scouted at least once a week from now on through the end of the season to protect those pods from these pod-feeding insects. [Video shows Ben Thrash, Graduate Assistant, Entomology, University of Arkansas Division of Agriculture sweeping with a net to collect worms and then shows worms collected in the net.]
Our thresholds for stinkbugs are nine stinkbugs for 25 sweeps. So if you take a 25-sweep sample, but you want to get an average of those four points that you take in the field. So if you get nine or more per 25 sweeps, we recommend treating that field.
For more information on soybean insect pests, contact your local county extension office or visit our extension website. [For more information visit www.uaex.edu. University of Arkansas Division of Agriculture Research and Extension University of Arkansas System, Arkansas Soybean Promotion Board.]