If, for example, you have chinch bugs, the BT will have no effect, and the problem will just get worse. Identification is critical, though, when using BT sprays. If you want to stay organic, and can confirm the issue is cutworms or sod webworms, spray liquid BT (Bacillus thuringiensis) products. Just as in controlling chinch bugs, three applications of liquid insecticide spread over two weeks usually does a great job of breaking the egg cycle. These are short-residual materials, however, and repeat applications are required to control the next generation. Sod webworms and cutworms are both readily controlled by most liquid insecticides approved for turfgrass - bifenthrin (goes by Bifen IT & Talstar at retail), malathion or any synthetic pyrethroid or carbamate out there. Their life cycle is completed in 5-6 weeks with several generations per year. The larvae remain active for several weeks, and then pupate. The first signs of sod webworm damage are areas of unevenly or closely clipped grass and patches of brown. The eggs hatch in 7-10 days, and the larvae begin feeding on the grass. The females scatter eggs at random early in the morning as they fly over the grass. While resting, the wings of the moth are closely folded about the body.
Adult sod webworms are small, white-to-gray moths with a snout-like projection on the front of their heads.
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