We monitored seasonal emergence and flight activity of adult western bean cutworms for 23 consecutive years (1979-2001) by capturing moths with blacklight traps sited in commercial dry bean fields between near Twin Falls, Idaho. Trap captures at 29 fields monitored between 1979 and 1990 were used to derive a time-sequential sampling plan (Pedigo & van Schaik. 1984. Bull. Entomol. Soc. Am. 30:32-36) that categorizes moth captures through time into two contrasting population growth-curve types as functions of degree-days: endemic (non-economic) vs outbreak (economic) configurations. The former gives rise to larval populations that remain below economic thresholds while the latter results in larval populations that exceed economic thresholds. Models were validated by using trap captures from 30 fields monitored between 1991 and 2001.
Species 1: Lepidoptera Noctuidae Richia albicosta (western bean cutworm)
Keywords: time-sequential sampling
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