Green or Black, the Inchworm Will Attack

Whether green, black and/or brown, inchworms will not attack humans, but they will attack crops, plants, and gardens. In fact, inchworm eating habits can cause massive destruction to food crop foliage. They will eat as many holes as they can in the leaves of all kinds. While inchworms may seem like a nuisance to farmers and gardeners alike, they are valuable to fishermen. Excellent for fishing, inchworms can be purchased online or through any bait store and they can be found all over North America.

About Inchworms

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An inchworm is the larvae of moths of the family Geometridae (phylum Arthropoda, class Insecta, order Lepidoptera). This large, widely diffused group has more than 1,200 species indigenous to North America. Some inchworms are considered average while others are considered extraordinary. Inchworms do, however, have many common characteristics. They have smooth, hairless bodies, and they typically grow up to one inch in length. Their colors run the gamut from brown and black to bright green.

Also referred to as loopers, measuring worms, and spanworms, inchworms have three pairs of legs at the front end and two to three pairs of prolegs or larval abdominal appendages at the rear. Inchworms travel by drawing their hind end forward while gripping the earth with its prolegs. They have the ability to stand erect and motionless when poked or prodded in any way.

Much like spiders, some inchworms have the ability produce thin delicate lines. In some cases, these thin lines are made of silk. It just so happens that one of the most destructive types of inchworms, called cankerworms, produces soft silk threads as they drop from trees to evade predators. Also called measuring worms, cankerworms vary in color, but their bodies consist of long horizontal stripes. Cankerworms feed on shrub foliage and tree foliage. These creatures like to hang out in apples, elms, oaks, lindens, sweetgums, and a wide variety of other shade and fruit trees.

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Another type of inchworm, also called Looper and Cabbage Looper, overwinters as green to brown pupae tightly wrapped in cocoons (not webs) of white thread. In the spring, the adult moth emerges. The adult lays its eggs, typically on the surface of leaves. Once the larvae emerge, they feed for two to four weeks. Once they’ve had their fill, the larvae spin cocoons similar to the ones used during the overwinter process. The larvae prefer vegetable gardens and they eat a variety of crops including: celery, cabbage, cauliflower, radishes, Brussels sprouts, beans, parsley, broccoli, potatoes, tomatoes, and peas.

How to Control Inchworm Populations

There are several ways to control larvae/ inchworm infestations. Inchworms have natural predators, specifically Trichogramma wasps. Birds, yellow jackets and paper wasps also feast on inchworms, so allowing these types of animals and insects to roam free in your garden or around your crops should help control your inchworm population. Wilt disease causes the worms body to rot. This usually happens late in the season. Wilt disease causes the inchworms body to rot. This usually happens late in the season. Better known as Bt, bacillus thuringiensis a wilt pathogen that is available to gardeners to help control infestations. This pathogen is only toxic to insects. If you would like more information about bacillus thuringiensis or to purchase products containing bacillus thuringiensis please visit: http://www.dirtworks.net/B.T.-Insecticidal-Soap.html.

1 Comment

  1. Kenny Schoborg

    I think the worms I’m having trouble with are the brown version of inch worms. I’m having trouble right now with them getting into my house. I sprayed the foundation with home defense to keep bugs and such out of the house, but this didn’t help. Do you have any suggestions? Sure could use some advice

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