Description and damage This moth has a wingspan of 0.5 to 0.7 inch and is dark olive-green with yellow and gray mottling. The mature larvae are about 0.4 inch in length with a whitish with brown head and yellow-brown thoracic shield. Larvae bore into tips of branches and the terminal shoot causing dieback as the leaves wilt and turn brown. Damage is most evident on young trees after the terminal is killed and the growth structure altered.
Biology and lifecycle In Oregon, larvae emerge in July and pupate in August. The maple tip moth appears to overwinter in the adult stage. In spring, the moths lay eggs near the tips of branches. Come May, the first evidence of tip dieback occurs as the caterpillars bore into and feed within the shoots.
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Chemical Control of Landscape Pests
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