Weedar 64Weedar 64 is sold in 2. 5 gallon containers. Weedar 64 is intended for control of many broadleaf weeds in forests, non cropland turf areas, and aquatic areas. The liquid herbicide reacts with the plant's natural metabolism, causing distorting and twisting effect within the plant. In an essence the plant grows itself to death. Dosage Rate: 1 quart per acre. Refer to product label for application rate specific to your water acreage. Pond Calculator Use