For use with Ornamentals, Non-Crop and Labeled Crops as a pre-emergent weed control.
Casoron 4G controls weeds underground, before they emerge, by forming an herbicidal vapor barrier in the upper layer of soil when activated by rainfall or irrigation water. Existing weeds rooted in this vapor barrier soon die off and any weed seeds germinating in or below the barrier are killed when new roots and shoots contact the vapor barrier. Deep-rooted perennial weeds are prevented from emerging. Plants with roots below the barrier are not harmed.
Casoron 4G works on the growing points (new root and shoot tips) of germinating seeds or emerging perennials by inhibiting cell wall production. Because of this mode of action, application before weed seed germination or emergence provides the best control and eliminates the need for removal of unsightly dead plant material. With an active period of from 4 to 7 months in the soil, a single application will usually provide season-long weed control.
In the Pacific Northwest, West of the Cascade Mountains, the optimum timing for Casoron 4G applying is from mid-winter through early spring. In areas where winters are drier and colder, fall applications are usually preferred. In any area, however, it is important to remember that the herbicide must be incorporated into the soil by precipitation or irrigation to be effective.
Specialized formulations of Casoron are also available for control of problem aquatic weeds and for treatment under newly laid asphalt.