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There are two different strategies to handling cutworms. If you are dealing with a lawn that has a history of caterpillar damage, you can go with a preventative strategy where you put your material down before you see any serious damage. In the North, that would be early to mid-May, but earlier in the South. The second strategy would be treating a lawn when the caterpillars are present, but you need to find out if you have them. Birds probing your lawn are a good indication you have caterpillars because they are an excellent food source for them. You can also use a soap solution to inspect for any cutworms. Use one tablespoon per gallon of water, and spread it out over a square yard of the lawn where you think you might be seeing damage. “They get irritated by the soap and they will crawl to the surface, usually within a few minutes,” he says. If you have them, you could use chemicals including, chlorantraniliprole, pyrethroids such as bifenthrin, deltamethrin and lambda-cyhalothrin, or the botanical pesticide neem. If you aren’t interested in using chemicals, you can use the nematode, Steinernema carpocapsae or the bacterium Bacillus thuringiensis kurstaki, but Swier says to make sure you use them properly. Both work best if applied to small caterpillars. Nematodes need light watering after application to get them off the foliage and to protect them from both heat and sunlight. The bacterium is also subject to degradation by sunlight and should be applied in the early evening. Lifespan and location The lifespan of a cutworm depends on the location and the type. “The individual cutworm only lives a month or so, but there are several generations. Each generation produces new adults that lay eggs which hatch into more larvae,” he says. Swier says the adults will live a week or two laying the eggs. Bronze cutworms produce one generation a year, and are tolerant to cooler weather and will overwinter as eggs. “Sometimes the eggs can hatch underneath the snow and the caterpillars will feed under the snow,” Swier says. You may see some feeding in the spring, but most of the feeding will be in May or June. They will spend the summer as a pupa, the stage between the caterpillar and the adult, and then emerge as an adult in the fall and die after laying their eggs back down on the turf. Black cutworms, which are another grass feeder, will overwinter in the South and are blown North by spring winds from the Gulf of Mexico. They can have five or six generations in the south, but only one to two in the North. They will land on lawns as adults in April or May, and that’s when they deposit their eggs on the turf. “The black cutworm, because it comes up in early spring, will do most of its damage by early June for the first generation in the north and the second generation in late July and early August,” he says. The black cutworm does most of its damage on short cut grasses on golf courses and is not a serious problem on home lawns. Variegated cutworms, much like black cutworms, overwinter in the south and get blown north, and there are two generations a year in north, but five to six in the in the south, and they can live year round in the extreme south. The author is associate editor at Lawn & Landscape. He can be reached at bhorn@gie.net. |
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