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In this study, we report on the compatibility of two commercially available predatory mites, Neoseiulus californicus and Phytoseiulus persimilis, with three miticides used in greenhouse production systems to control the twospotted spider mite, Tetranychus urticae. We determined the lethal effects of the miticides chlorfenapyr, spiromesifen, and bifenazate to both predatory mite species 24 hours after exposure to spray applications in petri dishes. Two rates of chlorfenapyr (0.40 and 0.81 mL/2-L) and spiromesifen (0.15 and 0.31 mL·L -1 ), and one rate of bifenazate (0.62 mL·L -1 ) were used. All rates were based on the manufacturer label recommendations for twospotted spider mite. Both rates of chlorfenapyr and spiromesifen, and the single rate of bifenazate were not harmful to N. californicus with percent live mite values i 85% for chlorfenapyr and i 95% for spirome- sifen, and 93% for bifenazate. However, these same miticides were substantially toxic to P. persimilis with percent live mite values of i 63% for all the miticides tested. Based on the results of this study, the miticides chlorfenapyr, spiromesifen, and bifenazate are compatible with N. californicus whereas these miticides are toxic to P. persimilis indicating a difference in susceptibility based on predatory mite species. Twospotted spider mite, Tetranychus ur- ticae Koch (Acari: Tetranychidae) is a major arthropod pest in greenhouses, particularly during the warm season when populations can reach excessive levels within a short pe- riod of time (Helle and Sabelis, 1985; Zhang, 2003). Commercially available miticides are typically used to control twospotted spider mite outbreaks. However, continued reliance on miticides increases the probability of T. urticae populations developing resistance (Dittrich, 1975; Carbonaro et al., 1986). As a result, greenhouse producers are evaluating the use of alternative management strategies for twospotted spider mite that may avoid relying strictly on miticides (Sabelis, 1981). An alternative management strategy, as opposed to relying solely on miticides, is to incorporate the use of predatory mites into greenhouse production systems. Two preda- tory mites that are available to greenhouse producers are Phytoseiulus persimilis Athias- Henriot (Acari: Phytoseiidae) and Neoseiulus

hortscience

Compatibility of Three Miticides with the Predatory Mites Neoseiulus californicus McGregor and Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae)