11/10/2022 0 Comments Southern blight![]() ![]() Several nitrogen sources, such as ammonium nitrate, were effective in suppressing soilborne pathogens consequently, nitrogen was able to minimize the severity of S. Nitrogen may be associated with disease severity mitigation in plants, as it is a vital nutrient for their survival. Soil fertility helps to suppress soilborne pathogens. Pesquisa Agropecuária Brasileira, Brasília, v.42, n.2, p.155-161, 2007.) are alternatives to southern blight management. Formulação do fungo Coniothyrium minitans para controle do mofo-branco causado por Sclerotinia sclerotiorum. ) and inoculation with antagonistic biocontrol agents ( BROŽOVÁ, 2004 BROŽOVÁ, J. Efeito de adubos nitrogenados na supressividade de solos a fitopatógenos. Soil fertility ( GHINI, et al., 2001 GHINI, R. ![]() Annual Review of Phytopathology, Palo Alto, v.23, p.97-127, 1985. The Biology, Ecology and Control of Sclerotium rolfsii. ) and the low host specificity of its pathogen impairs the adoption of appropriate crop rotation and using genetic resistance ( PUNJA, 1985 PUNJA, Z.K. Efficacy of biological and chemical treatments for control of fusarium root and stem rot on greenhouse cucumber. Effect of solarization and Gliocladium virens on sclerotia of Sclerotium rolfsii, soil microbiota, and the incidence of Southern Blight of tomato. Southern blight is difficult to manage due to the low efficiency of the chemical control ( RISTAINO et al., 1991 RISTAINO, J.B. Caracterização biológica e fisiológica de isolados de Sclerotium rolfsii obtidos de pimentão no Estado do Maranhão. Variability in Indian isolates of Sclerotium rolfsii. Therefore, it enables plant tissue penetration by fungal mycelium ( PUNJA, 1985 PUNJA, Z.K. The secretion of oxalic acid triggers the infectious process and reacts to calcium in the cell wall, which first produces calcium oxalate, then the pathogen secrets pectinase and endopolygalacturonase (enzymes). It is round-shaped and its size ranges from 0.5 to 3 mm in diameter. rolfsii has a melanized outer layer, cortex and a medulla consisting of thread-like hyphae. ![]() Biocontrol mechanisms of Trichoderma strains. Sclerotium rolfsii colonizes crop residues and produces sclerotium (resistance mechanism) to survive environmental extremes, such as lack of food sources for long periods-of-time ( BENÍTEZ et al., 2004 BENÍTEZ, T. This fungus can infect over 500 plant species due to its low host specificity ( PUNJA, 1985 PUNJA, Z.K. Sclerotium rolfsii, the pathogen of southern blight, causes root and crown rot, wilt and damping off in plants. ![]()
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