Abstract
Fusarium wilt in melon (Cucumis melo L.) is widespread, responsible for serious economic losses in yield of melon in Egypt. Laboratory and greenhouse experiments were performed to evaluate the effects of different biocontrol agents (BCAs) against Fusarium oxysporum f.sp. melonis. In vitro, Trichoderma viride and Gliocladium virens significantly reduced the mycelia growth of E oxysporum f.sp. melonis that produced 86.33 and 86.11% reduction, respectively. Under greenhouse conditions, 1022, caruso, primal and ideal genotype were the best genotypes for tolerant the infestation by E oxysporum f. sp. melonis by 60% survival plants when compared with other genotypes. On the other hand, all BCAs tested significantly decreased the disease incidence of E oxysporum f.sp. melonis. The treatment with T viride completely suppressed the disease incidence after 15 days from sowing giving 100% survival plants and 96% living plants after 45 days.