Abstract
The location and extent of the first known outbreak of Nepytia phantasmaria (Strecker) in California is described. The preferred host in the State is Douglas-fir. The insect lays eggs on the needles in fall. Larvae appear concurrently with new needle growth in May. The first 2 instars feed on these needles and the third to fifth instars feed on older needles. Pupation occurs on the needles in late summer and lasts about 14 days. Adults aggregate at dawn and dusk, and probably mating and oviposition take place then. At the height of the outbreak in 1965 a polyhedrosis virus caused heavy larval mortality.
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