Adults overwinter in leaf litter or other vegetation, primarily in or near wooded areas. They become active in April and move to the earliest host plant available. They feed for several days, then mate. Each female lays 175 to 250 eggs in clusters of...
Larvae are whitish with dark brown markings at both ends. The larvae also have conspicuous segments and six tiny legs near the head. These larvae/worms grow to a length of about 10 mm. The pupae are soft-bodied, white, and only about 5 mm long.
Recommended management practices include:
Adults overwinter in leaf litter or other vegetation, primarily in or near wooded areas. They become active in April and move to the earliest host plant available. They feed for several days, then mate. Each female lays 175 to 250 eggs in clusters of 12 to 24 in the soil at the base of plants. Eggs hatch in one to three weeks, depending on the temperature. The larvae find their way to the base of the stem or roots and feed for 3 to 6 weeks. Mature larvae form earthen cells within which pupae form. Damage to soybeans is due primarily to the foliar-feeding adults. Bean leaf beetles prefer the youngest plant tissue available. When vegetative growth terminates, they will consume tender pod tissue. Pod damage is usually limited to the outer layers of the pod. Damage is usually greatest in July and August. In addition to this beetle's direct attack, these adults are also known vectors of the bean pod mottle, cowpea mosaic, and southern bean mosaic viruses. The larvae can also cause some damage, as they feed on the root and stem tissue.
Eggs are lemon-shaped, orange in colour, and about 0.85 mm long.
The adult bean leaf beetle varies greatly in colour and markings. It is typically reddish-brown with black margins and about 5 to 6 mm long. Each wing cover usually, but not always, is marked with three or four black spots. All bean leaf beetles, however, have a black triangular-shaped spot on the forward margin of the wings.
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