This study aimed to clarify the predation potential of Harmonia axyridis on Spodoptera exigua and S.frugiperda by investigating the predation functional response and search efficiency of H.axyridis towards the second-instar larvae of these lepidopteran pests under indoor conditions.The control effect of H.axyridis on early-stage larvae of S.exigua and S.frugiperda was evaluated in a net house.The indoor study demonstrated that both male and female adults of H.axyridis exhibited a Holling Ⅱ type functional response towards the second-instar larvae of S.exigua and S.frugiperda.The instantaneous attack rate(a)of female adults on S.exigua and S.frugiperda larvae was 1.120 and 0.987,respectively,with control efficiencies(a/Th)of 134.514 and 154.408 individuals,and daily maximum predation rates(1/Th)of 120.124 and 156.437 individuals,respectively.The instantaneous attack rate(a)of male adults on SS.exigua and S.frugiperda larvae was 1.071 and 0.830,respectively,with control efficiencies(a/Th)of 116.262 and 124.568 individuals,and daily maximum predation rates(1/Th)of 108.540 and 150.039 individuals,respectively.The net house experiment showed that under the ratios of 2∶300,4∶300,and 8∶300,H.axyridis effectively controlled the population of early-stage larvae of S.exigua and S.frugiperda,with control efficiencies above 65％,80％,and 95％respectively,after eight days of release.In conclusion,H.axyridis shows potential for effective control of early-stage larvae of S.exigua and S.frugiperda.These experimental results provide a theoretical basis for the utilization of H.axyridis in integrated pest management strategies for these pests.
Harmonia axyridisSpodoptera exiguaSpodoptera frugiperdapredation functional responsebiological control
NETL
NSTL
万方数据
