Ground Beetle Beneficial Insect

Ground beetle
Ground beetle
Ground beetle

Ground beetles are beneficial insects.

Adult ground beetles and their larvae eat asparagus beetles, caterpillars, Colorado potato beetles, corn ear worms, cutworms, cabbage root maggots, Gypsy moth larvae, slugs, snails, squash vine borers, and tobacco bud worms. A single ground beetle larva can eat more than 50 caterpillars. Adults hunt their prey in the soil and on plants and trees.

Ground beetles are not attracted to the garden by specific plants, but a diversity of perennial plants will give them places to hide and find food. Ground beetles feed at night and hide under boards, rocks, tree bark, and garden debris during the day. You can encourage ground beetles by providing shelter.

The ground beetle is a shiny hard-shelled insect about ⅛ to 1½ inches long. Most ground beetles are dark colored, black or bronze, but some are metallic green, blue, gold, or red. They have a narrow head with threadlike antennae and sometimes can be mistake for cockroaches. Larvae are dark brown or black grubs with 10 segments tapering toward the rear.

Most ground beetles have large mandibles to capture their prey. Ground beetles are very quick when they move to capture prey.

Female ground beetles lay eggs in the soil. The larvae hatch and feed on soil dwelling pests for two to four weeks then pupate in the soil. Adults overwinter in the soil and emerge again in the spring. There is one generation of ground beetles each year. Ground beetles can live for several years.

There are more than 2,500 species of ground beetles in North America and more than 40,000 species of ground beetles worldwide.

Scientific name: Calosoma scrutator


Written by Stephen Albert

Stephen Albert is a horticulturist, master gardener, and certified nurseryman who has taught at the University of California for more than 25 years. He holds graduate degrees from the University of California and the University of Iowa. His books include Vegetable Garden Grower’s Guide, Vegetable Garden Almanac & Planner, Tomato Grower’s Answer Book, and Kitchen Garden Grower’s Guide. His Vegetable Garden Grower’s Masterclass is available online. has more than 10 million visitors each year.

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