Efficacyof Amblyseius cucumeris Oudemans on Predating Phytophagous Mites at TeaPlantations

Efficacyof releasing predatory Amblyseiuscucumeris Oudemans in tea plantations to mitigate damages brought about byphytophagous mites was evaluated. Predatory A.cucumeris were releasedat a rate of 60000~70000 mites/667m² before peak infestation periodat a tea plantation. Twenty days after the release, the control on Polyphagotarsonemuslatus reached 76.13%. Comparatively, the same biological controlmeasure produced an efficacy of 52.50% in 10 d and 81.76% in 20 d on Acaphyllatheae Watt.