Abd EI-Megid, M.S. ; A.G. Rahal , Nashwa A.H. Fetyan
and M. Fadel
( 2009). Biocontrol Activity Of Some Antagonistic Microorganism Against Some Important
Peanut Diseases Under Egyptian Conditions
Egypt. ]. of Appl. Sci., 24( 5B) 2009 481-496
Abstract: Efficacy of thirteen isolates of antagonistic bacteria (Bacillus subtilis and B. thuringensis) and fungi (Chaetomium globosum, Gliocladium virens, Trichoderma harzianum, T viride and T ressi) as seed dressing in controlling damping-off, root rot and pod rot diseases on peanut was evaluated. The commercial biocide Clean root and the fungicide Rizolex T were also used as seed dressing. Bacillus thuringensis 536, B subtilis 50 and Trichoderma ressi were generally the superior treatments in decreasing damping off incidence. While, B. subtilis 50, B. thuringensis 536 and Clean root were them most effective treatments in controlling root rot. All treatments applied decreased percentages of pod rots infection ranged from 19.3 - 58.0% and 17.2 - 55.3% during the two experimented seasons. On the other hand, significant increases in pod yield were recorded when used B. subtilis Nos. 49 & 22, B. thuringensis Nos. 341 & 536 and T ressi. Also, plant growth parameters of shoot and root measurements were improved by treating peanut seeds with each of the antagonistic microorganisms tested. Treating seeds with each bioagent applied exhibited low values in nitrogenase activity compared with the control in soil. Total count of bacteria increased in seeds only treated with antagonistic bacteria and fungi. Treating seeds with B. thuringensis Nos. 341 & 536 gave the highest total count of bacteria in soil, while the highest total fungi were found with B. subtilis Nos. 47 & 64, T. viride and B. thuringensis Nos. 133 & 341.
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