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.
Musk and Canada thistle are in full bloom and should be mowed. John Creswell, central Iowa, continued to receive calls about uneven corn. There may be several factors causing uneven corn including soil compaction, shallow planting, sidewall compaction in no-till fields, herbicide carryover, and low organic matter. Soybean cyst nematodes are showing up in fields in this area. Malformed soybean leaves are fairly common, especially where beans were flooded after a heavy rain, reported Jim Fawcett, east central Iowa.