An above-normal amount of bird feeding activity on the lawn may alert you to an early infestation. There can be several generations of webworms each season with the most severe damage usually occurring in mid to late summer. There is a simple test you can do to determine if webworms are present in your lawn. Apply the entire mixture at the edge of both damaged and undamaged areas. The worms will come to the surface within 10 minutes.
Diagnostic kits are available for commercial licensed operators.
This test also works with cutworms and armyworms Sound cultural practices, especially proper irrigation, will usually allow your turf to outgrow light to moderate webworm injury. If fifteen or more webworm larvae are present per square yard in reasonably healthy turf, an insecticide application may be needed. For a complete list of both organic and inorganic chemicals, come to our Insecticides page.