Non-consumptive effects of Cheilomenes sexmaculata on the fitness of Aphis gossypii
Natural enemy insects are important biological factors in pest control,which can not only decrease population of pests through direct predation,but also change the growth,development and reproduction of pests through non-consumptive effects,indirectly affecting the fitness of pests.Winter melons and vegetables are important crops for high-efficient development of tropical agriculture in Hainan,and an aphid,Aphis gossypii,was considered as an important pest causing great damage to cucumbers and other melons crops.For comprehensive assessment of the impact of natural enemies on aphid populations,the life table method was utilized to investigate the non-consumptive effects of a local predatory natural enemy,Cheilomenes sexmaculata,on aphids,A.gossypii.The results revealed that the non-consumptive effect of C.sexmaculata on A.gossypii varied depending on the duration of treatment.After a 24-hour treatment,the aphid offspring showed a significant decrease in the longevity,reproduction duration,total reproduction,and R0.The research findings indicate that the non-consumptive effects of C.sexmaculata significantly altered the growth,development,reproduction,and other population life table parameters of the aphids.The findings will contribute to a more thorough assessment of ladybeetles'capacity to regulate aphid populations,thus offering novel approaches for ecologically-friendly aphid management(especially resistant aphids).
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