Abstract
The effects of temperature and ultraviolet radiation on the biology of Nosema fumiferanae and its host, Choristoneura fumiferana, were investigated. The temperature at which the host is reared has a definite effect on the parasitic microsporidan. Temperatures above 23 °C are detrimental to the parasite and temperatures above 28 °C are detrimental to the host as well. Spores of N. fumiferanae become inactivated by 5 to 6 h of exposure to sunlight, or 3 to 4 h of exposure to a 30-W germicidal (ultraviolet) light.

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