Aerial Application of Clincher® SF and Grasp® Herbicides
Uniform plant coverage is essential to the performance of both Grasp® and Clincher® SF herbicides. The best application strategy is to apply with well calibrated equipment which provides uniform coverage and weed control.
Use a minimum of 1 qt./A of an agriculturally approved adjuvant.
Crop oil concentrate must be used for all applications of Clincher SF.
Crop oil concentrate or methylated seed oil is needed with all applications of Grasp.
Use of a drift control agent is not recommended with Clincher SF.
A spray volume of 10 gal./A or more, and uniform coverage are required for optimum performance.
Use high flow rate nozzles to apply the highest practical spray volume with a uniform pattern.
Use the minimum number of nozzles that provide uniform coverage.
Orient nozzles to help provide uniform, consistent spray patterns and coverage.
Reducing the effective boom length to 70 percent of the wingspan of fixed-wing aircraft or 80 percent of the helicopter rotor width may further reduce drift without reducing swath width.
Apply at a height that provides the most effective swath width for the aircraft. Making applications at the lowest height that is safe reduces exposure of droplets to evaporation and wind.
Apply when drift potential is lowest – between wind speeds of 2 mph and 10 mph. High winds also disrupt spray patterns causing inconsistent coverage and weed control. State and local regulations regarding minimum and maximum wind speeds during aerial application may be more restrictive.
Temperature and Humidity
Droplet evaporation is greatest when conditions are both hot and dry. When possible, avoid applications during the middle of the day when wind and temperatures are generally the highest.
Consult ASABE S-572 Standard compliance, nozzle manufacturer catalogs, NAAA booklet or USDA literature or Web site for proper nozzle and application conditions.