The effect of integrating some pesticides and azodarchite extract in reducing the number density of the infective phase of root knot nematodes Meloidogyne incognita in tomato in the laboratory

Abstract

The study was conducted in the nematode laboratory in Tartous governorate and the biological control research and studies laboratory at Damascus University to evaluate the efficacy of the organophosphorous pesticide Nimacor (Fenamiphos) and the carbamate pesticide Vydate (Oxamyl) in combination with the leaf extract of azedracht (Melia azedarach) in the second-stage juveniles of root-knot nematodes Meloidogyne incognita, extracted from Tomato plant roots in Tartous Governorate for the year 2020, The results of the corrected death rate showed the superiority of the pesticide Vydate with the extract of the leaves of azedracht (solution B) in killing the individual of the second larval stage of root-knot nematodes 8.6 at a low concentration of 5 ppm after 24 hours of treatment at a temperature of 24°C. At a concentration of 50 ppm, the pesticide Nimacor was superior to azedracht leaf extract (solution A) with a kill ratio of 59.1, and the LC50 azedracht leaf extract, solution A and solution B after incubation for 24 hours was (482, 84.6 and 91.57 ppm), respectively, while The LC50 after incubation for 48 hours (50.2, 18.4 and 6.49 ppm) respectively, and the toxicity of the tested compound has increased by increasing the concentration.