黄地老虎幼虫取食棉花根茎部对植株上部叶螨适合度的影响

Effects of Cotton Roots and Stems Infested by Agrotis segetum larvae on Fitness of Tetranychus truncates,Tetranychus turkestani and Tetranychus dunhuangensis on Cotton Leaves

【目的】研究黄地老虎幼虫取食棉花根茎部,对植株上部叶片上截形叶螨Tetranychus truncates、土耳其斯坦叶螨Tetranychus turkestani和敦煌叶螨Tetranychus dunhuangensis种群适合度的影响。【方法】以中棉所49为供试棉花品种,在室内比较分析健康棉花植株和被黄地老虎幼虫取食为害棉株上3种优势棉叶螨生长发育和繁殖的差异。【结果】黄地老虎幼虫取食棉花根茎部显著延长截形叶螨若螨发育历期,但对幼螨存活率、若螨存活率、幼螨发育历期、产卵前期、单雌有效产卵量和雌成螨寿命无明显影响。黄地老虎幼虫取食棉花植株显著降低土耳其斯坦叶螨的单雌有效产卵量,但对幼螨存活率、若螨存活率、幼螨发育历期、若螨发育历期、产卵前期和雌成螨寿命无明显影响。黄地老虎幼虫取食为害显著延长敦煌叶螨幼螨和若螨发育历期,但对幼螨存活率、若螨存活率、产卵前期、单雌有效产卵量和雌成螨寿命无明显影响。【结论】黄地老虎幼虫取食为害棉花根茎部对截形叶螨、土耳其斯坦叶螨和敦煌叶螨种群适合度的影响较小。

【Objective】This project aims to illustrate the effects of infested cotton,roots and stems were chewed by Agrotis segetum larvae,on population fitness of Tetranychus truncates,Tetranychus turkestani and Tetranychus dunhuangensis on cotton leaves.【Methods】Based on cotton cultivar CCRI 49,the effects of cotton plant infested by A.segetum larvae on growth,development and reproduction of T.truncates,T.turkestani and T.dunhuangensis were investigated in laboratory.【Result】The developmental duration of T.truncates nymph in infested cotton plant was significantly prolonged compared with the control,but there were no significant differences in larva survival rate,nymph survival rate,developmental duration of larva,pre-oviposition period,fecundity and female adult longevity of T.truncates between the infested plants and the healthy ones.The number of effective eggs per female of T.turkestani in the chewed cotton was substantially reduced compared with the control.The infection of A.segetum larvae on roots and stems did not signi ficantly affect the larva and nymph survival rate,developmental duration of larva and nymph,pre-oviposition period,as well as female adult longevity of T.turkestani on cotton leaves.The developmental duration of larva and nymph of T.dunhuangensis in infested ones was significantly prolonged.No significant differences in larva survival rate,nymph survival rate,pre-oviposition period,fecundity and female adult longevity of T.dunhuangensis between the infested cottons and the healthy ones were found.【Conclusion】Cotton roots and stems infested by A.segetum larvae made no difference on the population fitness of T.truncates,T.turkestani and T.dunhuangensis.