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orange-black-red spots caterpillar (Western Tussock Moth caterpillar)

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Western Tussock Moth caterpillar
by: Moni

Pamela,
Your photo is of the Western Tussock Moth caterpillar, family Erebidae.
According to the USDA Forest Service, this caterpiller feeds on snowbrush ceaonthus, bitterbush, willows, serviceberry, wild rose, desert peach and bitterberry. It is considered and economic pest of fruit trees noted on apple, apricot, and oranges in California. It is found in the northwest US and British Columbia.
The moth male is mottled gray-brown while the female is wingless, fuzzy and very light colored.
The eggs overwinter then hatch from March to June with the caterpillars seen generally from June on.
There are many parasites and predators of this insect which generally keep the populations under control.

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