2,4-D LV ester
Rate 3 lb ae/A
Time Apply when rabbitbrush has 3 inches of new spring growth.
Remarks Soil moisture should be above wilting coefficient. If Sandberg bluegrass has dried up or lost its color, soil is too dry for rabbitbrush active growth, and it is too late to spray.
Caution Avoid drift to sensitive crops.
Site of action Group 4: synthetic auxin
Chemical family Phenoxy acetic acid
picloram (Tordon)
Rate 0.25 to 0.5 lb ae/A
Time Any time during the growing season.
Remarks A selective treatment that will not damage perennial grasses at the suggested rate.
Caution Most formulations are restricted-use herbicides. Do not contaminate water. Do not use in diversified crop areas. Potatoes, beans, and most other broadleaf crops are sensitive to picloram.
Site of action Group 4: synthetic auxin
Chemical family Pyridine