Put the Crunch On Cutworms
Excerpt from American Country magazine field guide to natural pest control, including cutworms, tachinid fly.
March/April 1987
By the Mother Earth News editors
MOTHER'S HANDBOOK
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The second issue of American Country, MOTHER's new sister magazine, contains an indispensable field guide to natural pest control. This brief excerpt will help you keep cutworms from your crops. By Susan Glaese
Cutworm (Noctuidae family)
Range: Throughout North America
Description: 1 " grayish brown caterpillars, some with spots or stripes. Nocturnal-rarely seen in daytime. Curl up when disturbed. Adult "Miller's moth" is gray or brown with paler hind wings and 1" to 1 1/2" wingspan.
The name cutworm is justifiably ominous. You won't know you've got cutworms in your garden until they've performed their guillotine act and decapitated several of your plants. There are approximately 20,000 kinds of cutworms, including tunneling, subterranean, and climbing species (such as the armyworm), but the surface feeders are the most common. These spend two summers as destructive larvae (overwintering in the soil) before they mature into harmless moths.
Modus operandi: Fells young plants by cutting off stems at or just below soil surface. Favorite victims: Your carefully nurtured garden seedlings.
Controls:
• The traditional-and very effective control is to set a small 2" to 3" collar, pressed 1 " into the soil, around each vulnerable plant. Collars can be made of paper, cardboard, PVC, metal cans, paper cups, or toilet tissue tubes.
• Bacillus thuringiensis, a widely available caterpillar-killing bacterium,is a very effective control for climbing cutworms as well as for the surface feeders.
• Handpick larvae at night by flashlight.
• Mulch plants with oak leaves, crushed eggshells, damp wood ashes, or other skin irritating physical barriers.
• Deep plowing, digging, or tilling in fall and again in spring will expose and kill soillaid eggs and overwintering larvae. Chickens let into the plot after these cultivations will help improve the effectiveness of this technique.
• Tachinid flies, trichogramma wasps, braconid wasps, and insect-killing nematodes parasitize cutworms.
• Toads, moles, shrews, blackbirds, meadowlarks, and firefly larvae are all natural predators.
• The adult moths can be attracted to, and killed by, electronic bug zappers.
• Sprinkle cornmeal around your garden. Cutworms love it but can't digest it. Some will die from overeating the treat.
• Make a mixture of molasses (another vice), water, wheat bran, and hardwood sawdust. Circle plants with this glop. It dries on the cutworms' bodies and immobilizes them.
• It's said that if you push a small twig, nail, or toothpick into the earth right next to a seedling, the cutworm cannot wrap around the stem and fell the plant.
• According to University of British Columbia student Greg Salloum, cutworms would rather starve than eat plants treated with extracts of pineapple weed or sagebrush.
