Date of this Version
Insect Science, Plant Disease, & Weed Science, University of Nebraska Cooperative Extension, Institute of Agriculture and Natural Resources 89(05) (April 18, 1989)
In This Issue:
- CRP Acres - Postemergence Weed Control
- Combination Herbicides--What's In a Name?
CRP Acres - Postemergence Weed Control
Several herbicide treatments are registered for postemergence broadleaf weed control in CRP plantings including Ally, Buctril, Curtail, Glean, 2,4-D and 2,4-D + Banvel. Curtail can be used only on established grasses. The other treatments can be used on grasses from the 3-leaf stage on, except 2,4-D and 2,4-D + Banvel which must go on after the 5-leaf stage. Grasses in this juvenile stage especially warm season grasses will not tolerate the higher rates of 2,4-D and Banvel used on established grasses. Grasses germinating this spring will be injured by residues of earlier 2,4-D and Banvel applications.
Combination Herbicides--What's In a Name?
The prepackaged herbicide picture continues to change. Evaluating weed control performance, crop safety, and carryover potential of combinations compared with tank mixtures is dependent on the amount of each component in the combination. sometimes it is difficult to tell how much atrazine is contained in 3 qt. of Bicep or 3 qt. of Extrazine II. The following table lists the equivalent amount of each component contained in a gallon or pound of some combination products. The totals don't always add up to 1 gallon or 1 pound of herbicide because the combination products may be more or less concentrated than the individual herbicides.