Worms in the summer crops

Worms in the summer crops

Saw two different soybean fields, in two different counties,  in two different growth stages, with two different worms.  The more mature growth stage was in Grant and had web worms to the point of losing yield.  The very immature beans were in Garfield County, double cropped into wheat stubble.  The worm in that one was the corn ear worm, and the worm population was such that it was a threat to the stand. Both need an insecticide.

I am writing this three days later than the above paragraph.  It seems this may be a "wormy" year.  I am seeing more worm damaged fields daily.  Many soybean fields are showing leaf defoliation but not at economic thresholds.  Soybeans can take about 30% defoliation to the leaves in the pre bloom stage and about 20% defoliation after bloom, but the trick is to watch your fields carefully because as the worm population builds up they can quickly do a lot of damage.  I usually do not like to spray for insects without getting close to or being at economic threshold...........but, it might be a good idea to throw the insecticide in the tank if you need to go over the top of the crop with glyphosate anyway.  Why waist a trip over the ground if your showing signs of worms.

Soybeans are not the only summer crop showing worm presence and damage.  They are also in the alfalfa, grain sorghum, and corn.  Not much you can do on the corn if they are in the ear, or on the milo if they are buried in the whorl, but you can effectively spray on alfalfa or young corn or milo.



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