Abstract

The yellow headed fireworm, Acleris minuta (Robinson), has four discrete generations in southwestern Iowa: the overwintering gray color morph flies in April followed by the first-, second-, and third-generation flights of the orange color morph in late May, late June, and early August, respectively. The offspring of the third summer generation begin emerging as adults in mid-September. These gray moths overwinter and mate the following spring. Photoperiod triggers color morph determination. Repeated exposures of larvae to photophases of 12 h or less produce gray morph development and must begin not later than the fourth stadium.

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