Precipitation as a Factor in the emergence of Epilachna CorruptaFrom Hibernation

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Abstract
Three years' study of the emergence of the Mexican bean beetle (Epilachna corrupta Muls.) from hibernation show that there is a definite relation between precipitation and the emergence of the beetle and that the percentage emerging is influenced directly by the temperature during the period of rainfall. It is also apparent that heat alone is not sufficient stimulus to produce emergence, as no beetles emerged on some of the hottest days during the season, and that the period of emerg-enceis governed by a combination of the two factors. Emergence rarely occurs when the mean temperature is below 55°F., and reaches its maximum at a mean temperature of 58° to 69°F. Beetles in hibernation respond to the effect of artificial precipitation during the emerging season.

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