Effect of Some Biocontrol Factors and Their Efficacy in Resistance to Fusarium Wilt Disease Caused by Fusarium oxysporum F. sp. Cucumerinum on Cucumber Plant Under Open Field Conditions

The aim of this study is to evaluate the efficacy of some biological control agents in the resistance of Trichoderma harzianium, Trichoderma viride and mycorrhizal fungi Glomus mosseae, individually or collectively, Fusarim oxysporum f.sp. cucumerinum. The results of this study showed that the combined biological control factors had a positive and significant effect in reducing the severity of injury of the disease by 20% and 21% respectively, with an effect efficiency of 73.92% and 65.30% in reducing the percent of the injury severity. Followed by the treatment of mycorrhizal fungi G. mosseae, the results showed a reduction of injury severity with 26.7%, 23% and 65.18%, 62.47%. The use of T.harzianium and T. viride has also resulted in a significant reduction of the injury severity by 43.3%, 23%, 46.7%, 29.3%, 46.7% and 23%, respectively. In addition, the use of these biological control agents had a significant impact on the growth. An increase in the plant height, leaves number, wet and dry weight of plant was also observed.