Euseius concordis (Chant) and Neoseiulus anonymus (Chant & Baker) are predatory mites of the family Phytoseiidae commonly found on rubber trees (Hevea brasiliensis Muell. Arg.) in the State of Mato Grosso, in the mid-west Brazil. This work was conducted to verify the effect of acaricides and insecticides-acaricides occasionally used in rubber tree plantations, and other products that could be used against different pests (insects and mites) in this crop, on E. concordis and N. anonymus. The residual contact spray method in glass surface was used, which is recommended by the Working Group on "Pesticides and Benefic Arthropods" of the International Organization of Biologic and Integrated Control of Noxious Plants and Animals/Regional Section of the West Paleartic (IOBC/WPRS). Two concentrations of the following active ingredients were used: acephato, dicofofol, endosulfan, formetanate, metomil, monocrotophos, oxid of fenbutanin and propargit. For each product, one of the concentrations used was an average of the concentrations recommended by the manufacturers for the control of mites and phytophagous insects in other crops, since none of the tested products are registered for use on rubber tree. The other concentration corresponded to ca. a third of the former concentration. Endosulfan at 320ppm, dicofol at 100ppm and fenbutanin oxid at 100 and 320ppm were harmless to E. concordis, while endosulfan at 320ppm and dicofol at 100ppm were harmless to N. anonymus. Acephate, formetanate and monocrotofós, in concentrations, were harmful to both species.
biological control; predator; IPM; Hevea brasiliensis; pesticides
