Date of this Version
Insect Science, Plant Disease, & Weed Science, University of Nebraska Cooperative Extension, Institute of Agriculture and Natural Resources 87(14) (June 19, 1987)
In This Issue:
- Postemergence Weed Control
- Herbicide Drift On Gardens
- Storm Damaged Crops And Herbicide Injury
- Lawn Weed Control
Postemergence Weed Control
Corn--With large corn, drop extensions should be used on the sprayer to keep Banvel and 2,4-D out of the corn whorl to minimize injury. Corn injury is not a concern with atrazine, Brominal, Buctril, and Laddok, however, weeds taller than 4-6" are usually not killed. Banvel and 2, 4-D can make corn brittle increasing breakage from cultivation.
Herbicide Drift on Gardens
Drift onto gardens from 2,4-D, Banvel, and other herbicides sometimes occurs. The question arises as to whether or not the garden produce is safe to use after the drift happens. If the beans, tomatoes, vine crops, onions, and other vegetables produce near normal edible portions, consumption and preservation should present no problems.
Storm Damaged Crops and Herbicide Injury
There is a greater than normal injury risk when applying postemergence herbicides to crops damaged by wind, hail, and blowing sand and soil. The bruised and damaged tissue permits increased herbicide intake. Also, with some herbicides, there is decreased detoxification which increases injury risk. Waiting several days for the crop to recover from storm damage reduces the risk of herbicide injury. However, don't wait too long as the weeds will be growing also.
Lawn Weed Control
Summer months are not the time to apply 2,4-D, dicamba (Banvel), and MCPP (mecoprop) for broad leaf weed control. There is too much chance for injury to gardens, ornamentals, shrubs, and trees. Wait until October.