Yardim, E.N.Ozgen, I.Kulaz, H.2025-05-102025-05-1020011373-75032-s2.0-0035756670https://hdl.handle.net/20.500.14720/17911In this study, we tested the effects of two different doses of neem (azadirachtin) on the alfalfa weevil, Hypera variabilis Hbst. (Coleoptera: Curculionidae), aphids and predators (Coccinellids, anthocorids, chrysopids and spiders) and compared the effects with those of a broad spectrum insecticide (malathion) in a controlled experiment in 1998 and 1999. Malathion treatments reduced alfalfa weevil densities significantly (p < 0.01) by 77.9 and 87.4% in 1998 and 1999, respectively. Alfalfa weevil numbers in the low dose neem-treated plots were lower by 45.2% in 1998 and 50.2% in 1999. There were 45.3% fewer alfalfa weevils in the high dose neem-treated plots in 1999. In 1998, aphid numbers were reduced by 11.1, 25.3 and 41% in the low dose neem-treated plots, the malathion-treated plots and the high dose neem-treated plots, respectively. Aphids were more abundant in the malathion-treated plots, whereas they were fewer in the neem-treated plots compared to the control in 1999. The treatments did not have any significant effects on the total numbers of predators.eninfo:eu-repo/semantics/closedAccessArticle662 aN/AN/A51952412425073