Evaluation of Newer Chemicals for Control of Foliar Nematode on Begonia

Abstract

Eight new chemical compounds were evaluated for control of foliar nematode (Aphelencoides fragariae) on several cultivars of begonia (Hiemalis group). Two greenhouse experiments were conducted in 1993, one in 1994, and one in 1995, using foliar nematode-infested begonia cultivars, and treating them with abamectin, azadirachtin, bifenthrin, carbosulfan, cyromazine, diflubenzuron, fenoxycarb or imidacloprid. Oxamyl was included for comparison because of its known activity against this nematode. None of the newer chemicals was effective in reducing the population of foliar nematodes at the rates tested, whereas one application of 10% granular oxamyl at 0.12 g/l5 cm (0.004 oz/6in) pot was as effective as higher rates or multiple applications in suppressing the populations.