بررسی تاثیر کشندگی (LC50) نیمارین بر روی کنه‌ دولکه‌ای urticae Koch (Acari: Tetranychidae) Tetranychus

Two spotted mite, Tetranychus urticae koch is one of the most important pests of crops and greenhouses. Two spotted mite is one of the most polyphagous pests and its distribution is wide all over the world and so far its damage has been reported in more than 900 species and 124 plant families. To control this pest, various chemical pesticides are used, which have caused environmental pollution, the destruction of natural enemies and the resistance of mites. Therefore, the use of plant compounds such as neem seed extract of Azadirachta indica A. Juss from the Meliaceae family can be a good alternative. The mortality rate (LC50) of neemarin after 5 days on the egg stage were calculated 640 ppm and after 24, 48 and 72 hours on the 3rd nymph stage and mature stage of two spotted mites 560, 280, 230, 520, 330 and 250 ppm, respectively.. The results of statistical analysis of the effect of different concentrations of neemarin on oviposition rate and reproduction showed that there was a significant difference between the rate of oviposition preference and progeny production at different concentrations after 7 days and the lowest oviposition was observed in high concentrations of neemarin. In general, it can be concluded that neemarin as plant pesticides reduces use of pesticides, population and damages of two spotted mite, so this low-risk herbal compound can be used in integrated management of this pest.