ArticleExperimental & applied acarology2025
Host plant effects on the non-consumptive impact of Neoseiulus bicaudus on Tetranychus turkestani.
Article in Experimental & applied acarology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
When pests perceive the presence of natural enemies, their growth, development, and reproduction are significantly affected, a phenomenon known as non-consumptive effects (NCEs) of predators. Understanding the impact of NCEs on pests can help optimize biological control strategies. Neoseiulus bicaudus (Wainstein) is an effective predator of Tetranychus turkestani (Ugarov & Nikolskii), but its NCEs on this pest remain unclear, as does whether host plants influence the predation-induced stress. This study employed two-sex life table analysis to investigate how long-term NCEs affect the life-history traits and population dynamics of T. turkestani on common bean (Phaseolus vulgaris) and soybean (Glycine max). Results showed that the NCEs of N. bicaudus on T. turkestani varied between the two host plants. On both hosts, the developmental duration of the protonymph stage significantly shortened, while fecundity was unaffected by NCEs. NCEs significantly reduced the lifespan of T. turkestani on common bean but had no significant effect on lifespan on soybean. On common bean, the mean generation time decreased from 15.99 to 14.68 days under NCE, with no significant changes in intrinsic rate of increase or net reproductive rate. In contrast, on soybean, NCEs significantly increased the intrinsic rate of increase by 1.38-fold and the net reproductive rate by 1.43-fold, while shortening the mean generation time by 3.15 days. This study indicates that T. turkestani experiences negative NCEs on common bean but positive effects on soybean. Therefore, host plant characteristics should be comprehensively considered when evaluating the impacts of NCEs in biological control programs.
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