Severe weather damages crops; root rot in soybean

This information was summarized from a June 23 teleconference with ISU extension field specialists in crops.

  • Thunderstorms, wind, and hail occurred over the state last week. Rainfall from 1/2-inch to more than 7 inches was reported. There were reports from scattered areas statewide of hail and wind that caused crop damage.
  • In areas that had severe wind, greensnap was reported. Some fields had 10-40 percent of the plants affected. Uneven corn continues to be a problem in many areas of the state. Symptoms of potassium deficiency on corn were reported in a few fields that were short on moisture.
  • Stalk borers are migrating out of ditches into corn. Reports from Floyd and Cerro Gordo counties showed hopvine borer in fencerows.
  • Postemergence herbicides continue to be applied in soybeans with some herbicide burn to leaves. Control of woolly cupgrass and common waterhemp are causing concern.
  • Root rots are showing up on soybean plants. A lab test is needed to distinguish between two types--Rhizoctonia and Mycoleptodiscus; see pages 109-110 of last week's newsletter for more details.
  • Regrowth of alfalfa was reported to be generally good, up to 8 inches in south central Iowa. Some fields in east central and south central areas contain threshold numbers of potato leafhoppers; less than threshold numbers are showing up on alfalfa regrowth in other areas of the state.
  • Oats continue to be harvested for oat hay and silage. Barley yellow-dwarf virus was reported in east central and central areas. Wheat in the southeast area looks good with few reports of disease.

This article originally appeared on page 122 of the IC-478(15) -- June 30, 1997 issue.

Updated 06/29/1997 - 1:00pm