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[9000697.] رقم البحث : 9000697 - |
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Control of root rots of peanut (arachis hypogaea l.) With saponin of different sources in comparison with a fungicide / |
| تخصص البحث : General |
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Agricultural Research Journal Suez Canal University / |
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Nagwa A.I. Osman |
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S.M. Ali |
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S.A. Omar |
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Root rots - saponin - damping-off |
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Synthetic lucernes saponin, when mixed PDA medium before sterilization (1 g/L), resulted in (47.8, 41.1, 34.4 and 16.7%) reductions in mycelial growth of Macrophomina phaseolina, Rhizoctonia solani, Sclerotium rolfsii and Fusarium solani, respectively, in vitro compared with the control treatments.
Root-rot diseases incidence significantly decreased when peanut seeds were treated by the synthetic lucernes saponin (3 g/Kg seed) before sowing in potted soils infested with Macrophomina phaseolina or Rhizoctonia solani compared with the control. Whereas, other sources of saponin showed different variation in the diseases incidence. On the other hand, dressing peanut seeds with different sources of saponin or Rizolex-T, increased apparently healthy survived plants at harvest under field conditions of Behara Governorate during 2000 and 2001 seasons, since they decreased disease infection percentages. The highest reductions of pre-emergence damping-off diseases were observed when seeds were dressed with Rizolex-T, followed by the synthetic saponin. Also, the same results were recorded with root-rot diseases incidence.
As saponin and Rizolex-T treatments were not effective in decreasing percentages of R. solani colonies in roots of peanut at harvest, the opposite reaction was recorded with Fusarium spp. and M. phaseolina in most cases. However, Rizolex-T followed by the synthetic saponin were generally the superior treatments against colonies of Fusarium spp. |
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