BIOLOGICAL CONTROL OF BEAN DAMPING OFF CAUSED BY RHIZOCTONIA SOLANI | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 5, Volume 80, Issue 1, March 2002, Page 57-70 PDF (3.01 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2002.303049 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| AHMED A. EL-KAFRAWY | ||||
| Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| Isolates of Trichoderma spp. reduced the radial growth of Rhtbsctonla solani (Kuhn) by 59.6 — 78.4 % and Gliodadium spp. Inhibited the radial growth of RsoIan! by 57.2 —70.1%. Soil treatment with T.hamatum, T. harrianum, T.vitide and Gliodadium Wrens gave the maximum protection against pre and post-emergence damping-off and reduced the disease incidence from 50 to 6.6, 10, 10, and 10 % respectively, compared with the fungicide Rizolex at 10 %. Also, improved plant heights, fresh and dry weight, increased dry seeds yield from 4.5 with the control to 8.8, 8.7,8.6 and 8.5 gm in the above treatments, respectively, in comparison with Rizolex (8.2 gm) .The seed treatment with the bioagents was less effective than soil treatment. The soil treatment with antagonists remarkably reduced the population of R.solani in the soil from 30.5 to 0.01,0.03, 0.05, and 0.06 x 106 cfu respectively, in unsterilized soil after 6 weeks from sowing. The seed treatment with the antagonists was less effective. The bioagents gave persistent effect in reducing R.solani population for more than 6 weeks, while Rizolex was superior up to 3 weeks from sowing. | ||||
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