) Nattrassia mangiferae( بررسي امكان كنترل شيميايي و بيولوژيكي بيماري پژمردگي شاخه ، زوال و مرگ مركبات ناشي از قارچ

Investigation on the possibility of chemical and biological control of citrus branch wilt, decline and death disease caused by Nattrassia mangiferae

Citrus branch wilt, decline and death disease caused by Vattrassia mangiferae is one of the most devastating diseases of citrus; in Khuzestan province and causes heavy losses in this region every year. The aim of this investigation was to examine the chemical control measures against this disease. [he relative resistance of sonic citrus varieties to pathogen was tested with infection of two-year old scions in two separate experiments. In first experiment Lisbon lemon was the most susceptible. Laboratory experiments were conducted to evaluate the effect of six fungicides including Propiconazol, Copper oxychloride. Zineb, Benomii Tricyclazol and. Mancozeb against the pathogen on PDA culture. Results indicated that, Propiconazol was the most effective in inhibiting growth fungus. ʹFile FC (1 cif fungicides on PDA culture to N. mangiferae were determined. In an attempt to find a biological control method, antagonistic effects of Trichoderma long ibrachiatum. T. harzianum, T. harzianum 199, T. vireos were studied on N. mangiferae. In dual culture experiments and cultures on complete colony of N. mangiferae antagonists colonized the pathogen. However no antagonistic mechanisms ic: coiling, vaculization and lysis occurred. Volatile metabolites of Trichoderm r spp. Did not inhibit growth of pathogen.