Red turnip beetle larva
Size: Up to 1/2 inch long
Where/When: The larva feeds on the leaves, stems, and flowers of vegetable plants and weeds from the mustard family such as cabbages, turnips, flixweed, shepherd's-purse, and wild mustard, as well as on strawberries, dandelion, beans, and potatoes. The larva is active from April to May or early June.
Significance: Heavy feeding by both larvae and adults due to high numbers may stunt or even kill plants, particularly young seedlings and transplants.