BIOLOGICAL CONTROL OF PEANUT DAMPING-OFF DISEASE BY BACILLUS SPHAERICUSSOIL TREATMENT | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 1, Volume 83, Issue 1, March 2005, Page 1-9 PDF (2.17 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2005.236615 | ||||
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| Authors | ||||
| ABDALLAH I. EL-SHEHABY; SAMY M.A. MORSY | ||||
| Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| Three isolates of Bacillus sphaericus were isolated from the rhizosphere of white rot free-onion plants. All isolates exhibited antagonistic potential against some fungi infecting peanuts. The highest antagonism to Fusarium so/ani was detected with isolate B1. Isolate B2 was the most antagonistic to Rhizoctonia solani , whereas Sclerollum rolfsii was most antagonized by isolate B4 . The three bacterial isolates were not significantly different with respect to antagonizing Macrophomina phaseolina. Application of these bacterial isolates ( 3 x 10 8 cfu/ml) to potted soil resulted in a 57-71 % reduction of damping-off in the greenhouse when used at a rate equivalent to 4 I //fed. Field application at the rate of 4.5 1/ fed. after sowing resulted in a 48-77 % reduction in peanut damping—off with a 22.7-54.54 increase in yield over the control treatment. The bio—control potentiality was slightly increased when the rate of application was raised to 6 I / fed. accompanied with 44-56 % increase in yield over the control treatment . Soil spray with B. sphacricus at the rate of 6 I / fed. after planting seed could be recommended. | ||||
| Keywords | ||||
| Biocontrol Agents; Bacillus sphaericus; soil-borne fungi; onion | ||||
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