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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - Larger than 3/4 inch long > Cabbage loopers

Cabbage loopers
Photo Credit: Jeff Hahn, Univ. of MN Cabbage loopers
Photo Credit: Jeff Hahn, Univ. of MN

Cabbage loopers
Trichoplusia ni
Size: Up to 1½ inches long

Where/When: The larva prefers cole crops, such as cabbage, cauliflower, broccoli, kale, rutabaga, radishes, turnips, collards, horseradish, and other crucifers. The larva is active from July until the end of the growing season.

Significance: Damage may result in stunted growth; reduced yield; death of young seedlings; and malformation of cabbage, broccoli, or cauliflower.
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