How long for the moths to disappear after an application?
The insecticide does not kill the adult moths. Sod webworm control using insecticides kills the larva, or caterpillars, feeding on the grass. The adult moths do not feed. One application should be sufficient to control the larva. Also keep in mind that adult moths are often visible flying over a lawn but damage never occurs because the larva population may be quite low. Feeding damage will appear as areas of brown stubble, as the larva consume the leaves of the grass plant. It usually takes a population of one to two larva per square foot to cause noticeable damage. The larvas are difficult to find, as they will hide in thatch and debris along the soil surface. 2.
