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Objective   Tetranychus cinnabarinus  (Boisduval) is an agricultural mite pest threatens crops throughout the world, causing serious economic loses. Exploring the effects of acaricides on predatory mites is crucial for the combination of biological and chemical control of  T .  cinnabarinus .  Neoseiulus californicus  (McGregor) is one of the principal natural enemies of  T .  cinnabarinus , which can be applied in protected agriculture. In this study, the effects of sublethal concentrations of a new acaricide, SYP-9625 on two mite species, and the effects of the application concentration on predatory mite,  N .  californicus  were assessed. The aim of the present study was to evaluate the effect of SYP-9625 on life parameters and predation capacity of  N .  californicus  based on the concentration-response bioassay of  T .  cinnabarinus  to explor the application of the new acaricide with natural enemy  N .  californicus .    Method  All of the experiments were conducted under laboratory conditions [25 ± 1°C, 16: 8 h (L: D) and 75 ± 5% RH]. The sublethal concentrations LC 10  (0.375μg/mL) and the LC 30  (0.841μg/mL) against  T .  cinnabarinus  and the application concentration (100μg/mL) against  N .  californicus  were used to evaluate the effects of SYP-9625 on population parameters of  N .  californicus  based on an age-stage, two-sex life table and its predation capacity by functional response.    Result   cinnabarinus  females treated with LC 30  exhibited significantly reduced net reproductive rates ( R   0   = 11.02) in their offspring compared with females treated with LC 10  ( R   0   = 14.96) and untreated females ( R   0   = 32.74). However, the intrinsic rate of increase ( r   m  ) and the finite rate of increase ( λ ) of  N .  californicus  indicated that the application concentration of SYP-9625 had no significant negative effect on  N .  californicus  eggs ( r   m   = 0.277,  λ  = 1.319) compared to the control ( r   m   = 0.292,  λ  = 1.338). Additionally, most population parameters of  N .  californicus  showed a dose-dependent manner with the increase of the concentration of SYP-9625 against  T .  cinnabarinus . SYP-9625 also stimulated the control efficiency of  N .  californicus  against immobile stages including eggs and larvae.    Conclusion  This study demonstrated that sublethal concentrations of SYP-9625 can inhibit the population growth of  T .  cinnabarinus . In addition, the sublethal concentrations and the application concentration showed no effect on the population growth of  N .  californicus . These two advantages described above showed great commercial potential of this new acaricide based on population parameters of the two mite species and predation capacity of the predatory mite under laboratory conditions.

plos one

Laboratory assays on the effects of a novel acaricide, SYP-9625 on Tetranychus cinnabarinus (Boisduval) and its natural enemy, Neoseiulus californicus (McGregor)