The predation potential of Harmonia axyridis on Spodoptera exigua and Spodoptera frugiperda
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
