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Pots of orchid-growing media augmented with pollen-cap mite, Tyrophagus neiswanderi, and its predator, Hypoaspis sp., were drenched with carbaryl, deltametrin, dimethoate and methiocarb to compare their efficacy for mite control with natural predation. Mite populations were monitored by heat extraction from 50 ml of potting media on days 0, 2, 7 and 14 after treatment and compared with water treated controls. All pesticide treatments initially reduced pollen-cap mite numbers (P<0.05), but after 14 days only methiocarb sustained this reduction to a similar level achieved by the predation of Hypoaspis sp. in the controls. Dimethoate gave the least effective control of pollen-cap mite and caused the greatest reduction in Hypoasis sp. populations. The ability of these four pesticides, plus taufluvalinate, acephate and methamidophos, to reduce movement of pollencap mite was assessed. Flower stems (350 mm), with double-sided sticky tape encircling the top, were dipped in pesticide and stood in media with pollen-cap mite. After 48 h only methiocarb reduced (P<0.05) the number of mites moving up the flower stem.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Effect of pesticides on cymbidium orchid pollencap mite and its predator <i>Hypoaspis</i> sp