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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - 1/4 inch - 1/2 inch long > Diamondback moths

Diamondback moths
Photo Credit: Alton N. Sparks, Jr., University of Georgia, Bugwood.org

Diamondback moths
Plutella xylostella
Size: Up to 1/3 inch 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 late May or June until the end of the growing season with numbers decreasing after Spring.

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