Comparative evaluation of traps for monitoring the Douglas-fir tussock moth (Lepidoptera: Lymantriidae)
Keywords:
Douglas-fir tussock moth, Lepidoptera, LymantriidaeAbstract
Delta sticky traps consistently caught at least as many Douglas-fir tussock moths as did five other trap types in field experiments. Omni-directional non-sticky traps based on the Lindgren multiple funnel trap were relatively successful, but highly variable. Wind tunnel tests with a simulated pheromone (= titanium tetrachloride smoke), showed that plums generated from Lindgren 2-funnel traps contaminated the exterior surfaces of the traps and inhibited entry. Modified Lindgren 2-funnel traps with a plastic insert to reduce turbulence in the plume and with collecting jars containing water only, caught significantly fewer Douglas-fir tussock moths than traps with empty jars or jars containing soupy water or DDVP insecticide (No-Pest Strip). Traps with jars containing soapy water caught more Douglas-fir tussock moths than traps with jars containing DDVP, but catches were not different from those in traps with empty jars. The catches in traps with empty jars and jars containing DDVP were not significantly different.
Non-sticky traps show promise for monitoring the Douglas-fir tussock moth. However, improved designs must facilitate rapid capture of moths landing on the trap, and contamination of exterior surfaces must be minimized.
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