Alfalfa harvest in full swing

This information was summarized from a May 22 teleconference with ISU Extension field specialists in crops.

  • Scattered rainfall occurred across the state, with some isolated heavy rains (up to 7 inches) and hail on May 18. Replanting of corn and soybeans will occur in a few fields where hail damage was severe.
  • Corn is typically at the V2 to V4 growth stage (2- to 4-leaf collars visible). Soybean planting is more than 95 percent completed and most fields are at the V1 to V2 growth stage (fully developed leaf nodes).
  • Some replanting of corn and soybean has occurred because of hail, insect damage, poor emergence (due to dry and crusted soils), and frost.
  • Corn flea beetles have declined in most fields, except for a few problem fields in east central Iowa. There are scattered reports of black cutworm cutting and fields at economic levels are being treated or replanted. Wireworm populations are heavy in a few fields, mainly in south central and west central Iowa. Billbug damage was reported on seedling corn in several northwestern counties. Billbugs produce one generation and will die within several weeks.
  • The overwintering generation of bean leaf beetles is declining in most areas, but some soybean fields in eastern Iowa that are above the threshold are being treated.
  • Herbicide drift complaints are common. Suspected herbicide carryover on corn also is being reported.
  • Approximately 25 percent of the alfalfa fields have been cut in the southern two-thirds of the state. Alfalfa weevils are being managed by cutting the alfalfa.
  • The oat crop is reported to be good in most areas and is in the boot stage. Winter wheat in southern Iowa is headed.

This article originally appeared on page 87 of the IC-484(11) -- May 29, 2000 issue.

Updated 05/28/2000 - 1:00pm