Studies on biological control of spider mites on papaya.
Problems with Tetranychus on papaya [pawpaws] in Taiwan are mainly caused by Tetranychus kanzawai, followed by Panonychus citri, T. piercei and T. cinnabarinus. Problems are frequent from February to April. Several field trials were carried out in Taiwan during 1988-89, 1992 and 1993. Phytoseiulus persimilis and Amblyseius fallacis gave effective control. P. persimilis was more effective than A. fallacis when 2 or 3 releases with a total of 500 predators/plant were made. The best releasing position was on the lower leaves. By releasing A. fallacis twice, the biological control plots were less infested than the chemical and untreated plots.