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New Zealand Plant Protection 60 (2007): 89-93

Predator mite application methods for biological control of two-spotted mites in hops

P.W. Shaw and D.R. Wallis


The efficacy of a novel 'air stream' predator mite application method for the control of two-spotted mites (TSM, Tetranychus urticae) in hops was compared with a standard teaspoon release method. Predator mites (Phytoseiulus persimilis) were successfully established with a single release using both application methods and TSM declined to low numbers during the monitoring period. Application of predator mites with a delivery device attached to a conventional leaf blower mounted on a quad bike was equally effective and at least four times faster than hand application. There was no evidence of any physical damage to mites applied with the mite blower device. The potential of the Ďair streamí application method to improve the efficiency of biological control of TSM using predator mites is discussed.

Keywords: two-spotted mite, biological control, hops, predator mite, Phytoseiulus persimilis, application method.

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