کارایی خاک دیاتومه، نانو ذرات سیلیکا، کائولین، گوگرد میکرونیزه و اختلاط آنها روی کنه دولکه‌ای Tetranychus urticae Koch در شرایط گلخانه‌ای

Two spotted mite, Tetranychus urticae Koch. is one of the most important plant pests. Chemical pesticides are used to control this pest, which increases residual crop, eliminates natural enemies, and contaminates groundwater. Therefore, the use of non-chemical methods is considered by most researchers. In this regard, the effect of diatomaceous earth, silica nanoparticles, kaolin, micronized sulfur and their mixing on different biological stages of two spotted mites in laboratory conditions in a completely random plot design at 27±2 °C, relative humidity of 60±5 % and light period 16: 8 hours (light: dark) was evaluated. The results of probit analysis showed that the treatment of nanosilica with LC50 was equal to 18.00 ppm after five days on eggs, and 30.51 and 43.01 ppm on immature and adult mite after 72 hours. Also, in investigating the mixing effect of compounds, the highest lethal effect against eggs, immature and adult mites was obtained by mixing sulfur and nanosilica. Comparison of the mean effect of diatomaceous earth, nanosilica, kaolin, sulfur treatments and their combination on leaf chlorophyll index showed that the highest index was in sulfur treatment (42.53), also the lowest oviposition and progeny production was observed in sulfur and nanosilica mixing treatment. Due to the effect of sulfur on leaf chlorophyll index as well as significant control of egg, immature and adult mites by nanosilica and inhibition of oviposition and progeny production of sulfur and nanosilica mixing results, mixing sulfur and nanosilica can be used in the integrated management program of this pest.