Population Studies of the Spotted Alfalfa Aphid in Arizona in Relation to Temperature and Rainfall

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Abstract
Following the introduction of the spotted alfalfa aphid, Theriotiphis maculata (Buckton), in Arizona, an 87% reduction in its population occurred from 1955 to the end of 1959. Many factors were responsible. Of these, the specific effects of rainfall and temperature are discussed. Population peaks were frequent and usually occurred in April, July, and October. Rainfall was detrimental to the aphid population if a sufficient amount fell just prior to the expected buildup to initiate epizootic outbreaks of a fungus. Dates of population peaks were dependent upon temperature and relative humidity.

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