关键词: 德国小蠊, 粪便提取液, 毒饵, 引诱作用

Abstract:

Objective　Attracting effect of fecal extract of the Blattella germanica of different ages and genders on themselves was measured in the present study in order to provide more effective guidance on the chemical control of B. germanica. Methods　B. germanica feces were immersed in organic solvents to produce the extract, of which the attracting effect was measured by a four?arm olfactometer. Results　The ethanol fecal extract of early nymphs was the best to attract early nymphs, late nymphs, male adults and female adults, with the attraction rates of 39.72%, 40.56%, 38.33% and 34.17%, respectively, followed by fecal extract of late nymphs, the attraction rates of which were 30.56%, 30.56%, 27.22% and 26.11%, respectively. The extracts of male and female adult feces were the worst at attracting, though the one of male adult feces had an attraction rate of 22.22% to female adults, and that of the female adult fecal extract reached 24.72% to male adults, both higher than the effect of nymph fecal extracts and that between the same gender. The effectiveness of toxic baits increased significantly when added a certain amount of the ethanol extracts of early or late nymph feces; the 24 h kill rate of deltamethrin baits increased from 26.00% to 54.00% and 48.00%, respectively; the 24 h kill rate of phoxim baits increased from 20.00% to 48.00% and 40.00%, respectively. Conclusion　The fecal extract of early nymphs had a favorable attracting effect on the nymphs of all ages and male and female adults, while the fecal extract of a certain gender satisfyingly attracted the opposite. Mixed with the ethanol fecal extract of early and late nymph, the toxic baits demonstrated improvement in the killing efficiency.

Key words: Blattella germanica, Fecal extract, Bait, Attracting effect