Abstract
Ten recently developed pesticides have been tested against Tyrophagus longior, T. putrescentiae, and susceptible and HCH-resistant strains of both Acarus siro and Glycyphagus destructor. They were applied as dusts or emulsion concentrates to wheat and the mortality of added mites was evaluated 2 weeks later. Etrimfos at 20 ppm and profenofos at 10 ppm killed all mites of all strains. Propargite at 20 ppm killed all strains except HCH-resistant A. siro, whereas methacrifos at 4 ppm killed all except HCH-susceptible A. siro. Heptenophos at 2 ppm controlled susceptible and resistant strains of G. destructor. ‘Cycloprate’ at 200 ppm, and U42662, ‘isoprothiolane’, fenbutatin oxide and ‘xymiazol’, all at 20 ppm, failed to give complete mortality of any strain. Several compounds reputedly effective against plant-feeding mites or ticks were ineffective against the storage mites tested.
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