Evaluation of Predation Capacity in Post-diapause Predatory Mite,Neoseiulus barkeri

doi:10.16409/j.cnki.2095-039x.2022.09.013

Abstract

Abstract: The predatory mite Neosuiulus barkeri has a huge potential in agricultural production,as main biological control agent of pest mites and small sap-sucking insects.For the particularity of living organism,it is a present challenge to maintain the survival rate and predation capacity stability of predatory mites during transport/storage period.This brings much obstacle to the safe and efficacious application of N.barkeri.Inducing reproductive diapause proved to be promising for prolonging shelf-life of predatory mites.This study aims to evaluate the feeding preference and predation function of N.barkeri,which had passed through a diapause,utilizing selection coefficient and the Holling disc equation.Prey-stage preference of three N.barkeri strains,direct development strain,diapause strain and post-diapause strain,was determined with Tyrophagus putrescentiae as host.The results showed a coincidence of prey preference and predation ratio among three strains.All predators consumed more larvae than eggs,and more nymphs than adults.The three strains also had some differences:both direct development strain and post-diapause strain exhibited high preference for eggs and larvae,however the diapause strain only preferred larvae.The functional responses of three strains all fit the Holling II disc equation.Once terminated diapause,predators would rapidly recover development and predation power.Among direct development strain,diapause strain and post-diapause strain,the attacking rate (a) was respectively 0.6761,0.2731,0.6468,and the theoretical maximum predation was 12.8205,12.0482,14.4928 insects per day respectively.The post-diapause strain exhibited the highest theoretical maximum predation,yet no significant difference was found among the other two strains.The diapause strain had the longest handling time (T_h,0.0830 d),followed by direct development strain (0.0780 d) and post-diapause strain (0.0690 d).The estimated value of a/T_hindicated that post-diapause strain was more efficacious than the direct development strain,followed by diapause strain (9.37,8.67,3.29).Our findings suggest that diapause induction have no negative effect on the predation capacity of N. barkeri,instead it can promote their efficacy to a degree.

Key words: Neosuiulus barkeri, reproductive diapause, prey preference, predation function

CLC Number:

S476.2

LI Xiaomeng, LI Ling, GAO Chao, TANG Qingfeng. Evaluation of Predation Capacity in Post-diapause Predatory Mite,Neoseiulus barkeri[J]. Chinese Journal of Biological Control, 2022, 38(5): 1149-1155.

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