A winter-time census of NOW immatures, in four of its major hosts, indicated the presence NOW larvae of all instars and as well as a few pupae; no viable eggs nor adults were found. The accumulation of heat (day degrees) led to a fairly linear emergence of NOW males and females during spring and early summer. Though emergence rates slowed at the end of our adult-collection period, adult emergence continued well into the summer, at least 12 weeks after the first adults emerged in March.