General Information

General Information

Weedmaster herbicide is a selective postemergence herbicide for controlling a wide spectrum of annual, biennial, and perennia broadleaf weeds and brush in grass forages and selected row crops.

Mode of Action

Weedmaster contains two active ingredients: dicamba and 2,4-D. Weedmaster is readily absorbed by plants through shoot and root uptake, translocates throughout the plant's system, and accumulates in areas of active growth. Weedmaster interferes with the plant's growth hormones (auxins) resulting in death of many broadleaf weeds.

Application Instructions

Apply Weedmaster at the rates and growth stages listed in Table 1 and Table 2 as follows unless instructed differently by Food/Feed Crop-specific Informations or Nonfood/Feed Use-specific Information. Applications can be made to actively growing weeds as aerial, broadcast, band, or spot spray applications. Weedmaster may be applied using water or sprayable fluid fertilizer as a carrier. Sprayable fluid fertilizer may be used as the carrier in preplant or preemergence uses for all crops listed on the label. Postemergence uses with sprayable fluid fertilizer may be made on pasture, hayland, or wheat crops only.

The most effective application rate and timing varies based on the target weeds species (refer to Table 1 and Table 2). In mixed populations of weeds, thte correct rate is determined by the weed species requiring the highest rate.

Delaying application permits weeds to exceed the maximum size stated and will prevent adequate control.

All aerial and ground application eqduipment must be properly maintained and calibrated using appropriate carriers or surrogates.

Susceptible Plants

DO NOT apply under circumstances where spray drift may occur to food, forage, or other plantings that might be damaged or crops thereof rendered unfit for sale, use or consumption. Susceptible crops include, but are not limited to, cotton, okra, flowers, grapes (in growing stage), fruit trees (foliage), soybeans (vegetative stage), ornamentals, sunflowers, tomatoes, beans, and other vegetables, or tobacco. Small amounts of spray drift that might not be visible may injur susceptible broadleaf plants.

Limitations, Restrictions, and Exceptions



Weedmaster can be applied either postharvest in the fall, spring, or summer during the fallow period or to crop stubble/set-aside acres.

Apply Weedmaster as a broadcast or spot treatment to emerged and actively growing weeds after crop harvest (postharvest) and before a killing frost or in the fallow cropland or crop stubble the following spring or summer.

See Crop Rotational Restrictions in section V. General Restrictions and Limitations for the recommended interval between application and planting to prevent crop injury.

Rates and Timings:

Retreatments may be made as needed; however, do not exceed a total of 8 pints of Weedmaster per treated acre during a growing season. For best performance, apply Weedmaster when annual weeds are less than 6\" tall, when biennial weeds are in the rosette stage and to perennial weed regrowth in late summer or fall following a mowing or tillage treatment. The most effective control of upright perennial broadleaf weeds such as Canada thistle and Jerusalem artichoke occurs if Weedmaster is applied when the majority of weeds have at least 4-6\" of regrowth or for weeds such as field bindweed and hedge bindweed that are in or beyond the full bloom stage.

Avoid disturbing treated areas following application. Treatments may not kill weeds that develop from seed or underground plant parts such as rhizomes or bulblets, after the effective period for Weedmaster. For seedling control, a follow-up program or other cultural practices could be instituted.

Restricted Entry Interval

48 hours