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The caterpillars live from August to May in feeding tunnels and round chambers under the bark of tree trunks. The infestation can be recognized by the light brown caterpillar droppings, which appear in bark cracks. Preference is given to old trees and those weakened by annual tree pruning.
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The caterpillars are mostly found in oak trees or on the ground under them in late spring and early summer, and do not live on fences, walls, etc. as other caterpillars do. They have very long, white hairs contrasting markedly with shorter hairs. [1] The caterpillars of several other species may be mistaken for the oak processionary. [3]
The caterpillar is a serious pest that attacks more than 30 crops. The larva bores into the trunk or branches about 15–25 cm deep. The tunnel created is empty in the day time, but is filled with caterpillar during the night. It damages the bark of the tree resulting in dieback of the stem. Frass is visible in affected areas. [4]
The oak beauty caterpillar is brown, marbled with white, and has two small red lumps on the back of its eighth, ninth and twelfth segments and a small lump on the belly on the seventh, eighth and ninth segments. The caterpillar's head is slightly notched in the middle, possibly due to evolutionary pressures to resemble twigs in appearance.
The caterpillars are solitary nighttime feeders in early stages, when they curl up in a "j" shaped pattern during the day and resemble two-toned bird droppings. As the caterpillars age, they feed during the day. They molt four times.
Image credits: Detroit Photograph Company "There was a two-color process invented around 1913 by Kodak that used two glass plates in contact with each other, one being red-orange and the other ...
A larva (or caterpillar) eating an oak leaf. Acleris semipurpurana is found in the eastern United States and adjoining portions of southeastern Canada.It has been found in US states ranging from New York, Massachusetts, Connecticut and Pennsylvania in the northeast to Minnesota and Texas in the west, as well as the Canadian province of Ontario.
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