Fall armyworm(FAW),Spodoptera frugiperda(J.E.Smith),is a majorpolyphagous pest with the potential to seriously damage various crops.A better under-standing of FAW's performance on different hosts may help to predi...Fall armyworm(FAW),Spodoptera frugiperda(J.E.Smith),is a majorpolyphagous pest with the potential to seriously damage various crops.A better under-standing of FAW's performance on different hosts may help to predict which plants willbe attacked when the preferred host is absent,and facilitate the development of effectivepest management practices.We compared the larval performance of FAW fed on maizewith that of FAW fed on potato and tobacco,which are important crops in China,usingan age-stage two-sex life table and adult female oviposition preference experiments.Incage experiments with potato,tobacco,or maize as the host,FAW reared on maize exhib-ited the strongest performance with shorter developmental time in thc larval stage,longerlongevity,and a higher reproductive rate in adults.Females oviposited on maize in pref-erence to potato or tobacco.Compared with larvae fed on maize,those fed on potato andtobacco exhibited significantly lower survival,with only 31.61%and 8.13%developing tothe adult stage,respectively.Several life table parameters,including the mean generationtime(T),net reproductive rate(R^(0)),finite rate of increase(λ),and intrinsic rate of nat-ural increase(r)were negatively affected in FAW fed on potato and tobacco.Our resultssupport the preference-performance hypothesis,that is,that herbivore females maximizefitness by choosing host plants associated with strong larval performance.Although lar-vae and adults performed poorly on potato and tobacco,their offspring will be capable ofcstablishing populations on them,posing a potential threat to these crops in China.展开更多
基金National Key R&D Program of China(2019YFD0300101)The Agricultural Science and Technology Innovation Program(CAAS-ZDRW202007)China Agriculture Research System(CARS-02).We also give special thanks to Jennifer Smith,PhD for editing the English text of a draft of this manuscript.
文摘Fall armyworm(FAW),Spodoptera frugiperda(J.E.Smith),is a majorpolyphagous pest with the potential to seriously damage various crops.A better under-standing of FAW's performance on different hosts may help to predict which plants willbe attacked when the preferred host is absent,and facilitate the development of effectivepest management practices.We compared the larval performance of FAW fed on maizewith that of FAW fed on potato and tobacco,which are important crops in China,usingan age-stage two-sex life table and adult female oviposition preference experiments.Incage experiments with potato,tobacco,or maize as the host,FAW reared on maize exhib-ited the strongest performance with shorter developmental time in thc larval stage,longerlongevity,and a higher reproductive rate in adults.Females oviposited on maize in pref-erence to potato or tobacco.Compared with larvae fed on maize,those fed on potato andtobacco exhibited significantly lower survival,with only 31.61%and 8.13%developing tothe adult stage,respectively.Several life table parameters,including the mean generationtime(T),net reproductive rate(R^(0)),finite rate of increase(λ),and intrinsic rate of nat-ural increase(r)were negatively affected in FAW fed on potato and tobacco.Our resultssupport the preference-performance hypothesis,that is,that herbivore females maximizefitness by choosing host plants associated with strong larval performance.Although lar-vae and adults performed poorly on potato and tobacco,their offspring will be capable ofcstablishing populations on them,posing a potential threat to these crops in China.
