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The larvae (or caterpillars) emerge in April and initially eat the buds of oak trees and young leaves inside them. [ 1 ] [ 6 ] When fully grown, the larvae are between 25 and 29 millimetres (0.98 and 1.14 in) long with a body that can be yellow-green or darker shades of green.
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 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. The caterpillars pupate within the feeding tunnels, but adult caterpillars have also been found on dried leaves, which indicates that they also leave the feeding ...
Rabbits and rodents can cause injury to the thin bark and twigs of young trees. When snow covers food sources normally sought during winter, these animals often move into home lawns in search of food.
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.
An oak tree shows signs of the effect of Sudden Oak Death disease at the Los Trancos Open Space Preserve near Palo Alto, Calif. on Wednesday, July 13, 2011.
The caterpillar's head is slightly notched in the middle, possibly due to evolutionary pressures to resemble twigs in appearance. [6] The larvae are found from spring to fall feed on a variety of deciduous trees including oak (Quercus spp.), elm (Ulmus spp.), hazel (Corylus avellana), aspen (Populus tremula) and alder (Alnus glutinosa). [2]
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]