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Adult Elm Leaf beetles are about 1/4 inch long and yellow to olive green with a dark stripe down each side of their wing covers. There are usually four dark spots on the pronotum (segment right behind the head).
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The eggs are orange and spindle-shaped and the larvae are wormlike, black or black and yellow and up to 1/2 inch long. The pupae are orange-yellow with black bristles.
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Adult Elm Leaf beetles overwinter in protected locations, often in houses or other structures. They emerge in the spring and move to elm trees where they lay their eggs in groups of five to 25 on the underside of leaves. The larvae skeletonize the leaves making them appear netlike. Elm Leaf beetle larvae often move to the base of the tree in large numbers to pupate. There are two complete generations per year.
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*An example of damage caused by Elm Leaf beetles
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