Worms in beans

Worms in beans

Yesterday I saw two soybean fields that had evidence of worm activity in them. One very severe and one quite mild.  Due to the old frass (manure) and older skeletized leaves with the newer leaves being mostly in tact, as well as the absence of the worms themselves, would leave you to believe that most of them have come and gone. Soybeans until they start blooming can take about a 40% defoliage without yield loss.  That is a very ragged looking plant. The mild field was probably at 10 to15% defoliage and just needs to be watched, the severe field was eaten down to the stems and had it been caught earlier would have needed to be sprayed. Mostly we are dealing at this time with three type of worms: Army worm, Web worm, and Cabbage Looper, with the corn ear worm probably still yet to come in the season, and many times all three types are present at once.  It does not seem to be a true "worm" run on the beans, but a field to field thing, so monitor your fields.  

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