Southern corn rootworm

Diabrotica undecimpunctata howardi

Adult - The adult beetle is about 6 mm long with a bright yellowish-green body. The head, legs, and antennae are black, and twelve black spots are present on the wings.
Egg - The egg is dull yellow, oval, and about 0.6 mm long (the size of a pinhead).
Larva - The fully grown larva is 15 to 16 mm long with a yellowish-white, somewhat wrinkled body. It has six tiny brownish legs.
Pupa - White to yellow in color, the pupa is about 6 mm long.
Damage: Larval cause corn injury in the spring. They chew out round holes (0.75 mm in diameter) through the growing points, killing the terminal blades. Stands may be reduced 50 to 90 percent or more. Extensive feeding on the roots may occur late in the season. Plants with severe root damage lodge during wind and rain storms, often causing the stalks to "goose neck" and making harvest more difficult. In addition to direct injury, rootworms transmit bacterial wilt disease from infested plants to healthy plants and make wounds that allow the entry of rot organisms.

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