Paul Kassel, northwest Iowa, has received many calls about grasshoppers, but they are not causing enough damage to warrant treatment at this time. Corn borer numbers are light, and they are starting to bore into the stalk. Potato leafhopper numbers are high. Soybean leaves show some scorch from hot temperatures. Bill Lotz, northeast Iowa, has seen some fields with soybean cyst nematode.
Weeds are heavy in some fields, especially woolly cupgrass, waterhemp, and giant ragweed.
Corn is uneven in many fields but seems to be improving. Potato leafhoppers are above threshold in numerous alfalfa fields, reported Brian Lang, northeast Iowa. European corn borer are below economic threshold in most fields. Dick Deloughery, west central Iowa, reported potato leafhoppers in very high numbers in many new alfalfa seedings. Grasshoppers are present in soybean and alfalfa field edges.