With rainfall or overhead sprinkler irrigation, the active ingredient, dichlobenil, is released into the upper layer of soil. Seedlings in this zone are killed and shoots growing from below the barrier are killed when they grow into the herbicide layer. Deeper rooted woody ornamentals such as trees, shrubs, and certain groundcovers, are not affected by the active ingredient since their roots are growing below the chemical barrier.
Correct application is important.
Shallow incorporation or sprinkler irrigation is required when applications are made during periods of high temperatures. When the soil surface is hard or bare, the application should be incorporated as heavy rainfall can wash the granules from the area and possibly cause damage to desirable vegetation. Properly incorporated, the application will stay put with practically no lateral movement. Soil applications control and prevent annual and perennial broadleaf weeds and grasses. Affects only growing points of roots and shoots and prevents weed seed germination.