Field studies were conducted at Yoakum and Stephenville, TX; Jay, FL; and Midville and Plains, GA, to determine the persistence of imazapic applied to peanuts at 0, 70, 140, and 210 g ai/ha. The following year, cotton, sorghum, and corn were planted in the treated plots in Texas, cotton was planted in Florida, and corn and cotton were planted in Georgia and evaluated for carryover injury. Data collected to determine injury included plant heights and weights. In 1999 in Texas and in Florida and Georgia, there was no significant carryover injury to rotational crops from any of the imazapic rates. Data on cotton and sorghum plant height from Texas in 2000 showed height reductions for the 210-g/ha rate on cotton and the 140- and 210-g/ha rates on sorghum. These data showed no significant carryover effects to rotational crops from the 70-g/ha rate of imazapic applied to peanuts the previous year.

Nomenclature: Imazapic; cotton, Gossypium hirsutum L.; corn, Zea mays L.; peanut, Arachis hypogaea L.; sorghum, Sorghum bicolor L.

Additional index words: Carryover injury, herbicide persistence, herbicide residue.

Abbreviations: DAP, days after planting; EPOST, early postemergence; MAP, months after planting; PPI, preplant incorporated.