Abstract

Scepter, Canopy, Gemini, Classic, and Command are new soybean herbicides which were introduced in 1986 and are being used in Kentucky. These herbicides have gained widespread popularity because of their excellent control of cocklebur, pigweeds, morningglories, and velvetleaf. In addition, they can be applied in a variety of ways which makes them attractive to the soybean producer. However, these herbicides do have potential shortcomings in that they can persist in the soil for several months and cause injury to rotational crops such as corn or wheat. Since greater than 60% of the soybeans grown in Kentucky are rotated to corn, it is important to know the persistence potential of these newer soybean herbicides. Chlorimuron is one of the active ingredients in Canopy, Preview, Gemini, Lorox Plus, and Classic. We have conducted research with chlorimuron at rates comparable to those recommended for Canopy and Gemini. Research on the persistence of Scepter, Command, and Canopy was started in 1985. After having been applied to the soil and soybeans grown, corn was planted the following year, and the degree of corn injury monitored. The persistence of Scepter and Command was determined in three tillage systems: conventional moldboard plowing and disking; full-season no-tillage in which a wheat cover crop was killed with Gramoxone Super 10 days prior to planting; double-crop no-tillage in which soybeans were planted after wheat harvest. Canopy persistence was determined in conventionally tilled soils that had a pH of 5.3, 6.3, or 7.3. All herbicides were applied at their labeled rate and at 1.5 and 2 times the labeled rate.

Publication Date

4-1988

Volume

9

Number

4

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