اثرات کشندگی دیفلوویدازین، بایومایت® و چریش روی مراحل مختلف زیستی کنه قرمز مرکبات Panonychus citri (McGregor) (Acari: Tetranychidae)

The citrus red mite, Panonychus citri (McGregor) (Acari: Tetranychidae) is an important phytophagous species present in citrus growing regions of the world. Natural enemies of this mite are affected by application of broad spectrum insecticides against other pests. At this research the toxicities of three biorational compound, ie. difluvidazin, Biomit® and neemazal oil were assayed on different stages of citrus red mite. The mites were reared on orange (Citrus aurantium) leaves under laboratory conditions at 25±51ºC, 70±10 RH and 16/8 photoperiod. the range of effective concentrations on different stages of citrus red mite were estimated by Potter spray tower; then bioassay tests were done in five concentrations and four replicates. Data were analyzed by polo-plus software. The results showed that difluvidazin is effective on the stages of egg, larvae, and nymph but it doesn't have any lethal effects on adults. LC30 and LC50 of difluvidazin on egg, larvae and nymph stages were obtained as 1.288, 3.371 ppm, 0.918, 1.990 ppm and 3.383, 5.721 ppm, respectively. The larvae stage showed more sensitivity than two other stages. Also, were reported LC30 and LC50 of biomite® on larvae stage: 711.876, 980.707 ppm, on nymph stage: 700.639, 929.021 ppm and on adult stage: 683.164, 878.210 ppm. According to these results, the adult stage is more sensitive than the other stages. LC30 and LC50 for mites that exposed to neemazal were calculated 141.965, 267.195 ppm for larvae stage, 1040.550, 1345.167 ppm for nymph stage and 1144.892, 796.059 ppm for adult stage, respectively. Based on result, the larvae stage is more sensitive than the nymph and adult stages.