Effect of Temperature and Photoperiod on Orius tristicolor Feeding on Tetranychus pacificus123

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Abstract
Studies were conducted on the predation of Orius tristicolor White feeding on the Pacific spider mite, Tetranychus pacificus McGregor, at various conditions of temperature and photoperiod. The 4th and 5th instars of O. tristicolor consumed more adult and immature mites and generally more mite eggs than the earlier instars at 70, 78, and 92°F in the absence of light and at photo-periods of 4, 12, and 16 hours of light. At 78°F, there was no significant difference in the number of adult and immature mites consumed by the combined O. tristicolor nymph and adult stages in the absence of light in comparison to a 12-hr light regime. About 750 mite eggs were consumed per Orius individual (nymph plus adult stage) at 78°F and 12 hours of light in comparison to about 303 mite eggs consumed per Orius individual at 78°F in the absence of light. Nymphs of O. tristicolor attained the adult stage at 92°F without plant moisture when an abundance of mites was available as a source of food as well as moisture.

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