![]() ![]() In the spring, the young larvae feed as soon as the buds begin to swell and later roll themselves up in the leaves. The eggs appear to hatch before fall and the larvae likely overwinter in a hibernaculum. Pupation also occurs inside the leaf rolls later in the season.ĭuring summer, the female deposits her eggs in irregular masses on the leaves or other parts of the trees. The rolled leaves, held together with strands of silk, form enclosures in which the larvae rest and from which they emerge only to feed. The presence of leaves hanging from trees is caused by the larvae, which cut the midrib near the petiole. If possible, shade the maple for a while. Water the maple with liquid fertilizer and shade it for a few weeks. Newly formed galls are yellowish-green, but later become pinkish to red and finally black. The leaves curl inward and partially turn purple. Tiny growths, approximately 0.125 inches in size, occur primarily on the upper surfaces of maple leaves. ![]() The impact on the tree is generally negligible, but where defoliation is severe, dieback and mortality of some of the already weakened maples may occur. Maple bladder galls result from abnormal leaf growth due to stimulation or irritation from the feeding of mites. When populations are high, the foliage turns brown and the crowns may be completely defoliated. The presence of rolled leaves in late May and leaves hanging vertically during the entire season are characteristic of attacks by maple leafroller larvae. ![]()
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