Sod Webworms, HELP!?

Using Scotts GrubEx may be your problem. This product is not labeled for the control of Sod webworms. The active ingrediant (AI) is imidacloprid and this product is not labeled by any manufacturer that I know of for the control of sod webworm. Here is the data sheet information from the Scott's web site:

"What It Controls:

Preventive or early curative treatment for white grubs, including larvae of Japanese beetle, Northern and Southern masked chafers, May/June beetle, black turfgrass Ataenius, green June beetle, annual bluegrass weevil, billbugs, Aphodius beetle, European chafer and Oriental beetle."

As a general rule, you never want to apply an insecticide unless 1) You have identified the pest, and 2) The pest is present in sufficent number to warrant the expense and risks associated with control via a insecticide.

To scout for sod webworm, use pyrethrum or a detergent drench to bring the little critters to the surface so you can count them. One teaspoon of 6 percent pyrethrum or 1 oz. of detergent per gallon of water applied to a 1 sq. foot area of your turf will drive the caterpillars up and out. If you have more than two per sq. foot, it may make sense to control.

Products labeled for sod webworm control that are not restricted use pesticides are:

Sevin

Mach 2

Scimitar

Conserve

Biosafe

and Dylox

Apply when caterpillars are present. Here in Illinois that is late July/August. Your area may be different. Contact your local university extension office for the specifics in your area.

Always follow the directions on the label. Using an insecticide for a insect not labeled for control not only is a waste of money, it's a federal offense. Good luck and happy sod webworming!