The red palm weevil （RPW） Rhynchophorusferrugineus is one of the most invasive insect pests causing massive damage on date palms over the world. Synthetic pyrethroid insecticide beta-cyfluthrin has been evaluated ag...The red palm weevil （RPW） Rhynchophorusferrugineus is one of the most invasive insect pests causing massive damage on date palms over the world. Synthetic pyrethroid insecticide beta-cyfluthrin has been evaluated against developmental stages of RPW under laboratory conditions. These stages were exposed to residual film of the insecticide on transparent cups using a Potter precision laboratory spray tower. Percent mortality of males and females were recorded 0.5, 2.0 and 24 h after treatment. Furthermore, date palm offshoots were infested in mesh house, two months later, offshoots treated with 300 ppm （p.g/mL） beta-eyfluthrin using two methods dipping and injection. Bioassay test showed beta-cyfluthrin at 300 ppm caused 86,7% and 93,3% mortality against males and females after 2 h respectively with LC50 135.74 and 109.4 ppm. By increasing the concentration at 400 ppm, mortality reached 100% against males and females after 24 h, Developmental stages, eggs and larvae were more sensitive toward the insecticide, where at 120 ppm no eggs hatched after 96 h and 86.7% mortality was recorded at 200 ppm against larvae after 30 rain with LC50 93.19 ppm. In addition, dipping method of date palm offshoots in 300 ppm beta-cyfluthrin was a very convenient way to control all RPW stages compared to injection method. So, it possible to recommend this method for treating the date palm offshoots in such insecticide as one of the most important elements of integrated pest management for standardizing insecticide based quarantine protocols.展开更多
文摘The red palm weevil （RPW） Rhynchophorusferrugineus is one of the most invasive insect pests causing massive damage on date palms over the world. Synthetic pyrethroid insecticide beta-cyfluthrin has been evaluated against developmental stages of RPW under laboratory conditions. These stages were exposed to residual film of the insecticide on transparent cups using a Potter precision laboratory spray tower. Percent mortality of males and females were recorded 0.5, 2.0 and 24 h after treatment. Furthermore, date palm offshoots were infested in mesh house, two months later, offshoots treated with 300 ppm （p.g/mL） beta-eyfluthrin using two methods dipping and injection. Bioassay test showed beta-cyfluthrin at 300 ppm caused 86,7% and 93,3% mortality against males and females after 2 h respectively with LC50 135.74 and 109.4 ppm. By increasing the concentration at 400 ppm, mortality reached 100% against males and females after 24 h, Developmental stages, eggs and larvae were more sensitive toward the insecticide, where at 120 ppm no eggs hatched after 96 h and 86.7% mortality was recorded at 200 ppm against larvae after 30 rain with LC50 93.19 ppm. In addition, dipping method of date palm offshoots in 300 ppm beta-cyfluthrin was a very convenient way to control all RPW stages compared to injection method. So, it possible to recommend this method for treating the date palm offshoots in such insecticide as one of the most important elements of integrated pest management for standardizing insecticide based quarantine protocols.
