Effective of Some Acaricides on Almond Spider Mite (Schizotetranychus smirnovi Wainst.)

Document Type : Research Article


Agricultural and Natural Resources Research Center, Chaharmahal and Bakhtiari, Province


Almond spider mite was recently out broken in Saman orchards, chaharmahal va Bakhtiari province. Applying of pesticides to control of the pest increase production cost, environmental pollution, frequency of pesticide resistance and kill natural enemies. The effectiveness of some acaricides on control of the mite was studied in the lab and field conditions. Four acaricides including: Bromopropylate, Ferpyroximate, Fenazaquin, Hexythiazox were used in this study. Bioassay experiments were done by introducing deutonymphs on treated leaves which immersed in the acaricides solutions. Leaves were put on non-strill, water saturated cotton in the petri dishes (9.8 cm in diameters). Fifteen deutonymph were released on each leaf and petri dishes were kept in the incubator at maintaining 25±1° C, RH 55%±5 and photoperiod 14:10 (L:D) and the number of dead mites were counted after 24 h. The highest and lowest toxicity were observed in Fenpyroximate (LC50=0.814) and Bromopropylate (LC50=6.29) treatments, respectively. In the field conditions, the mentioned acaricides (at the recommended dosage) along with the water spraying were used to control of the pest. Sampling was done one day before, 3, 7 and 14 days after treatments application. Fifteen leaves of each tree (replicate) were randomly sampled and the number of alive mites was counted. Mean comparison using Duncan multiple range test (DMRT) indicated that all used acaricides significantly reduced the mite population.