By Scout Nelson
Kochia is a challenging weed that grows across many soybean fields. Farmers often use herbicides to control it but using the same herbicide over and over can lead to weed resistance. To prevent this, experts suggest mixing herbicides that work in different ways.
A recent study by South Dakota State University tested glufosinate and lactofen in kochia. The test was done when the weeds were about 3 to 6 inches tall. Glufosinate was applied at 32 ounces per acre, and lactofen at 12 ounces per acre. When each was applied alone, glufosinate gave 60% control, while lactofen gave 81%. But when mixed, the control increased to 94%.
This trial shows that combining the two herbicides gives better results. However, farmers should apply them during hot and humid days for better performance. During the study, temperatures were lower than ideal, so results may improve in better weather.
Farmers should also expect a small crop response after using the mix. This may appear as light spots on the leaves, but these usually fade within a week. A similar study in Wisconsin showed the same pattern.
This herbicide mix is safe for soybeans. It is not labeled for use on corn, and farmers should avoid applying it to corn fields. Also, lactofen does not work well on grass weeds, so other herbicides like glyphosate or clethodim may be needed for full weed control.
Photo Credit: istock-sandramatic
Categories: South Dakota, Crops, Soybeans, Education, Harvesting