Agronomy and Horticulture Department


Date of this Version



Insect Science, Plant Disease, & Weed Science, University of Nebraska Cooperative Extension, Institute of Agriculture and Natural Resources 89(14) (July 11, 1989)


Copyright 1989 University of Nebraska


In This Issue:

  • Late Season Broadleaf Weed Control in Corn and Sorghum
  • Rescue Treatments for Soybeans
  • Wiper and Bean Bar Applications
  • Nebraska Leafy Spurge Conference

Late Season Broadleaf Weed Control in Corn and Sorghum

Corn should not be sprayed with 2,4-D from a week before tassel emergence until after the silks turn brown. Treatments during this critical time often interfere with pollination and cause yield reductions. After the silks turn brown, pollination is complete and 2,4-D use can safely resume. The early planted corn in Nebraska is now in the stage where it should not be sprayed with 2,4-D.

Rescue Treatments for Soybeans

Most broadleaf weeds taller than 6" cannot be consistently controlled in soybeans with postemergence herbicides. There are no soybean herbicides that perform like 2,4-D and Banvel.

Wiper and Bean Bar Applications

Wiper applicators are popular for controlling tall growing weeds in shorter crops. The weeds should be at least. 10" taller than the crop. Roundup is the herbicide of choice for wiper applications in sorghum and soybeans. A concentration of 25% Roundup in water is used for control of broadleaf and grass weeds. Shattercane and volunteer corn are very susceptible to Roundup. Roundup concentrations of 20% work well on these plants.

Nebraska Leafy Spurge Conference