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Impact of egg viability, egg parasitism, and virus on 1974 Douglas-fir tussock moth defoliation potential in western Montana Public Deposited

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Douglas-fir tussock moth egg mass studies during winter 1974 indicate that natural factors such as low egg viability, egg parasitism, and virus do not alter the potential for heavy defoliation in two sections south of Frenchtown and one section northwest of Lolo, Montana.

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