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(15) (August 1, 1989)


Copyright 1989 University of Nebraska


In This Issue:

  • Late Season Weed Control in Corn and Sorghum
  • Bindweed Control Where Wheat is to be Planted
  • August Lawn Renovation
  • Herbicide Use Guide Revision

Late Season Weed Control in Corn and Sorghum

Late season broadleaf weed control in corn and sorghum is possible with 2,4-D. Such a treatment could make harvesting easier and reduce weed seed production. Treatments should be applied no later than flowering stage of weeds for control of seed production. Both corn and sorghum can suffer yield reductions from 2,4-D applied during the flowering period. As a guideline, 2,4-D use on corn can be resumed after the silk turns brown. The use of 2,4-D on sorghum can be resumed after the grain reaches the early dough stage. Sorghum should not be sprayed with 2,4-D between the beginning of head emergence and the milk stage of the grain. These late 2,4-D treatments will not cause lodging or stalk brittleness in the crop.

Bindweed Control Where Wheat is to be Planted

Fall is usually an excellent time to make herbicide applications for field bindweed control. However, healthy new growth on the bindweed is essential for good results. Avoid tillage for at least 30 days prior to treatment. Dry weather in some areas has reduced bindweed growth making it more difficult to control. It would be best to wait for rain and new bindweed growth before treating. This could be too late this fall for land going to wheat. September treatments are usually more effective than August treatments.

August Lawn Renovation

August is the time to get started with turf renovation. Roundup is a useful herbicide for such projects. Skip one or two mowings so there is good growth on the weeds and grass for herbicide intake and activity. Apply 2 1/2 to 3 oz. of Roundup/1000 sq. ft. using 1 gal or less of water. Delay vertical mowing, slicing, coring, and power raking for seven days.

Herbicide Use Guide Revision

Industry reps, extension agents, and all other users of our Herbicide Use Guide: now is the time to submit your suggestions for our 1990 edition. We appreciate your input of previous years. You have helped make the Nebraska Herbicide Use Guide a most useful weed control aid for farmers, dealers, applicators, farm managers, consultants, extension agents, and others.