UTILIZATION OF CERTAIN BIOCONTROL AGENTS AGAINST SUGAR BEET DAMPING-OFF AND ROOT ROT DISEASES | ||||
Journal of Plant Production | ||||
Article 18, Volume 28, Issue 1, January 2003, Page 371-378 PDF (2.6 MB) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jpp.2003.241877 | ||||
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Authors | ||||
M. K. EI-Kazzaz,1; H. M. EI-Zahaby2; M. M. Badr3; M. I. Gouda4 | ||||
1Agricultural Botany Department, Fac. of Agric., Kafr EI-5heikh, Tanta Univ., Egypt, | ||||
2Agricultural Botany Department, Fac. of Agric. at Tanta, Tanta Univ., Egypt, | ||||
3Agricultural Botany Department, Fac. of Agric., Kafr EI-5heikh, Tanta Univ., Egypt, | ||||
4Plant Pathol. Research Institute, ARC, Giza, Egypt. | ||||
Abstract | ||||
Some fungal and bacterial bioagents as well as an actinomycte isolate were screened for their antagonistic effects against Sclerotium rolfsii, Rhizoctonia solani, Macrophomina phaseolina, Fusarium oxysporum, and Fusarium solani in vitro. Trichoderma hamatum, T. harzianum, and T. pseudokoningii, as well as certain isolats of Bacillus subtilis and one isolate of Pseudomonas f1uorscens were the most effective bioagents in suppressing the radial growth of the four patboqens. Yet, they were less effective in retarding growth of Fusarium spp. as compared with the other pathogens under study. T. hamatum, T. harzaium, P. f1uorescense and B. subtilis under greenhouse (S. rolfsii-infested soil) and field (natural infection) conditions may be utilized to biological control of sugar beet damping-off and root rot diseases. Three different formulae, suspension, powder, and granules were prepared from T. hamatum, B. subtilis and Actinomyces isolate, to be utilized in field application. The most effective bioagent for controlling the seedling blight was Rhizo-N followed by the suspension of B. subtilis which exhibited the least percentage of seedling blight. While the least affective one was Plantguard the granules of Actinomyces, and B. subtilis. For controlling the root-rot diseases, the most effective bioagent was T. hamatum (powder), while B. subtilis (suspension or granules) and Actinomyces (granules) were the least effective bioagents in this respect. These treatments also caused an increase in root yield per plot. . | ||||
Keywords | ||||
Biocontrol agents. damping-off; sugar beet; and root rot diseases | ||||
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