Abstract

Formal studies of the quantitative aspects of tussock moth populations have been underway for about 10 years. Rapid progress has sometimes been limited by a shortage of natural populations large enough to measure and a lack of funds for intensive investigations. Both of these situations have recently changed, however, because of current outbreaks and the newly funded Douglas-fir tussock moth program. The result has been a considerable advance in understanding tussock moth population dynamics. In this paper, I will briefly review methods of population measurement, the general behavior of tussock moth populations, and the probable causes of population change.

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