关键词: 西花蓟马, 生长发育, 繁殖力, 热激, 啶虫脒, 亚致死剂量, 特定年龄阶段两性生命表

Abstract: 【Aim】 Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) is a dangerous invasive pest in the world, whose growth and development are greatly influenced by temperature. Our previous study indicated that heat shock did not achieve ideal efficiency in controlling F. occidentalis, but changed their sensitivity to insecticides. The effect of acetamiprid on life table parameters of the F₁ offspring of heat-shocked  F. occidentalis was determined to study whether reducing pesticide use could improve the control effect of high temperature and the optimum combination of high temperature and acetamiprid to control F. occidentalis. 【Methods】 Age-stage and two-sex life tables were constructed to evaluate the effect of 45℃ heat shock and acetamiprid on life table parameters of the F₁ offspring of F. occidentalis. 【Results】 For the F. occidentalis treated with acetamiprid after recovery for different time (8 h and 24 h) from 45℃ heat shock (2 h), the average durations of egg, the 1st instar larva and pupa of their F₁ offspring were significantly longer than the control which were only exposed to 45℃ heat shock for 2 h (P<0.01). And the longevity and fecundity of their F₁ offspring female adults were significantly less than the control (P<0.01). Although the developmental duration and female adult longevity of the F₁ offspring of the thrips treated with acetamiprid after recovery from 45℃ heat shock for 8 h showed no significant difference from that of the F₁ offspring treated with acetamiprid after recovery from 45℃ heat shock for 24 h, the adult pre-oviposition period (APOP) and the total pre-oviposition period (TPOP) of the F₁ offspring recovery from 45℃ heat shock for 8 h were significantly longer than those of the F₁ offspring recovery from 45℃ heat shock for 24 h (P<0.01), and the number of eggs laid per female of the F₁offspring recovery from 45℃ heat shock for 8 h was significantly less than that of the F₁ offspring recovery from 45℃ heat shock for 24 h (P<0.01). 【Conclusion】 Compared with only high temperature stress, reasonable combination of high temperature and insecticides might get better efficiency in controlling F. occidentalis. An optimum control effect can be achieved when the insecticides are applied at 8 h instead of 24 h after heat shock.

Key words: Frankliniella occidentalis, growth and development, fecundity, heat-shock, acetamiprid, sublethal dose, age-stage-specific two-sex life table