Field studies were conducted in Georgia and North Carolina during 1991 to evaluate single and sequential applications of DPX-PE350 (Staple) at various rates and application methods and in systems approaches. In Georgia the experiments were conducted at the Coastal Plain Experiment Station in Tifton and in North Carolina the experiment was conducted in Wayne County.

In Georgia, all Staple rates and methods of application provided less than 50% sicklepod control with soil applications providing the better levels of control. Coffee senna control from PPI and PRE applications was less than 45%. Sequential PRE and POST systems frequently provided at least 80% coffee senna control. Part of this control may be the result of competition from uncontrolled sicklepod. Staple did not control bristly starbur as a soil application but provided excellent POST control provided the bristly starbur was 1.511 tall or less. Staple also has no soil activity on Florida beggarweed but provides excellent POST control of Florida beggarweed. Peanuts are tolerant of Staple at rates of up to 0.08 lb ai/ac and thus there should not be any potential for injurious carryover to peanuts. Crop injury was 10% with Staple at 0.125 lb/ac, all other treatments had very minor injury.

In North Carolina, Staple provided poor sicklepod control with all treatments and POST treatments were the least efficacious. Staple at 0.063 lb/ac or higher provided >90% control of prickly sida. Ipomoea morningglory control was >80% with Staple POST and >90% with Staple sequentials of PRE+POST. Soil applications of Staple controlled common ragweed less than 50%. POST applications of Staple at 0.063-0.094 lb/ac controlled common ragweed >93%. Crop injury was less than 5% with all Staple applications.