The role of trichoderma, VA mycorrhiza and dry yeast in the control of rhizoctonia disease of potato (solanum tuberosum l.)
2008
Mohammed, A.S., University of Khartoum, Shambat (Sudan).Faculty of Agriculture, Dept. of Crop Protection | El-Hassan, S.M., University of Khartoum, Shambat (Sudan).Faculty of Agriculture, Dept. of Crop Protection | El-Balla, M.M., University of Khartoum, Shambat (Sudan). Faculty of Agriculture, Dept. of Horticulture | El-Sheikh, A.E., University of Khartoum, Shambat (Sudan). Faculty of Agriculture, Dept. of Soil and Environment Sciences
Laboratory and pot experiments were conducted to evaluate the efficacy of Trichodenna viride, VA mycorrhiza and dry yeast, separately and in combination, as an integrated strategy of Rhizoctonia disease management in potato crop. The challenge inoculation with T. viride caused a significant reduction in vitro in the linear growth of Rhizoctonia solani particularly when it was performed closer to the time of pathogen inoculation. With the exception of the number of stems, yield and growth attributes of potato plants infected with R. solani were significantly affected. T. viride application significantly increased the growth components (i.e., plant height, shoot fresh and dry weights, root fresh and dry weights) and tuber yield (i.e., number and weight of tubers) compared to potato plants inoculated with R. solani alone. Moreover, the disease incidence and severity, as stem canker or black scurf on progeny tubers, were also significantly alleviated by T. viride inoculation. Similarly, VA mycorrhiza enhanced both the growth and yield measurements of Rhizoctonia-inoculated potato plants and significantly reduced the harmful effects of the disease. The dry yeast appeared to be the least efficacious biocontrol agent to Rhizoctonia compared to the other two organisms; yet it also significantly improved the disease situation of the infected plants. The combined effect of T. viride and VA mycorrhiza with or without yeast excelled other treatment~ in alleviation of almost all tested facets of the disease development
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