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The codling moth caterpillars bore into a fruit within 24 hours of hatching from their eggs, usually traveling between 1.5 m to 3 m in search of a fruit. Because they are susceptible to predation, drying up, or being washed away between the period of hatching and boring into a fruit, the caterpillars are prompt in finding a fruit to feed on. [2]
When a caterpillar of the species encounters such a trail it will follow it, especially if there is a pheromone scent associated with it. There can be a hundred or more caterpillars in a head-to-tail procession, kept together by contacting the tail hairs of the caterpillar in front. If disturbed, they curl up defensively into a tight bunch. [7]
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.
The tree in which a female deposits the eggs is where the larvae will choose to feed. The most common host plants that caterpillars feed on are leaves from stonefruit trees. However, larvae will feed on many other types of tree foliage. Adult moths do not eat and live for 1–4 days. [7]
The digestive physiology of tent caterpillars is tuned to young leaves, and their need to complete their larval development before the leaves of the host trees become too aged for them to eat compels them to feed several times each day. At the onset of a bout of foraging, caterpillars leave the tent en masse, moving to distant feeding sites.
The oak processionary (OPM) (Thaumetopoea processionea) is a moth whose caterpillars can be found in oak forests, where they feed on oak leaves, causing significant damage. They travel in nose-to-tail processions (hence their name), often arrow-headed, with a leader followed by rows of several caterpillars abreast. [ 1 ]
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The adult apple sawfly is up to 5 mm (0.2 in) long with a brownish-black head and thorax and a brown abdomen. The larva is a caterpillar-like grub with a brown head and white body, growing to about 10 mm (0.4 in) when fully developed. [2]