Sampling for Pests with a Sweepnet - June 29, 2010
[Title Slide – Sampling for Pests with a Sweepnet. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board. Number 36 - June 29, 2010]
[Dr. Scott Akin, Extension Entomologist standing in a soybean field holding a sweepnet] My name is Scott Aiken, Extension Entomologist with the Cooperative Extension Service and today I’m going talk to you about proper use of a sweepnet for pest sampling. This is not a typical sweepnet but it’s very similar to the typical one you might find. This one is aluminum handled; a lot of them have wooden handles, three quarters to one inch in diameter. Fifteen inch diameter opening that’s usually the most important part because for sampling this is what the thresholds are based off of. And either a mesh or a cloth net that a lot of times has to be changed or you might have to get some replacement bags or maybe wash them every now and then. So this is essentially what it looks like, this is the important sampling tool that we use in soybeans and even in early cotton.
[Video shows Dr. Akin walking down a soybean row using the sweepnet] As far as sweep-netting, one of the most important things that we want to do is make sure that when you’re sweeping that you can actually have enough space between each sweep in the field, so you wanna make sure to take a step, this is what I do anyway, I take a step and sweep, and on the next step I sweep, the next step I sweep. And I try to take a long enough step to ensure enough space between sweeps. The reason for that is so you won’t jar or scare away any insects that are in the next the subsequent sweep.
Another thing too when your sweeping is to make sure that your sweep net is actually coming down at an arc and contacting the canopy hard enough and at a good enough angle to where you might want to get some leaves in there, not too many, but, you know just a few. And make sure you’re coming down at a good enough arc to jar any insect pest that might be in that canopy with each subsequent sweep that goes down and back and down and back. So you want to make sure that you’re aware that you’re trying to get every bit of the canopy with this.
[Dr. Scott Akin] And taller beans, the fifteen inches depends on where you think the insects are, if it’s hot a lot of times the pests may be lower in the canopy so you want to sweep deeper and harder into the canopy, if, of course in the early morning, late evening they may move higher up so you may be able to sweep a little bit higher.
[Narrator] Your Arkansas Soybean Podcast is a production of the University of Arkansas Division of Agriculture and was funded in part by the Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your local county Extension Office.
[Title slide - For more information contact your local county Extension office. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board]