Abstract
The periodicity of bark-beetle epidemics is one of the most interesting phenomena connected with their occurrence. The successful application of control and preventive measures is, to a considerable extent, dependent on the entomologist's ability to foresee an increase or a decline in the existing status of the infestation. Epidemics of the southern pine beetle, which is the chief consideration in this paper, are characterized by 1 to 3 years of intense activity. During the longer intervening periods the insects are extremely rare. Precipitation records for a number of localities throughout the Southeast have been tabulated and compared with the occurrence of epidemics of this insect. There is an apparent correlation between deficiency of rainfall and the abundance of this insect in destructive numbers. Heavy precipitation while the young broods are developing under the bark produces a very heavy and effective mortality.
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