Evaluation of some plant extracts on controlling damping off and root rot diseases of bean (Phaseolus vulgaris L.)

N.K. Soliman*; M.M. Saber* and M.F. A. Ahmed**
* Plant Pathol. Dept., Fac. of Agric., Cairo Univ., Egypt.
** Central Lab. of Organic Agric., Agric. Res. Center, ARC, Egypt.

The most dangerous effects of Rhizoctonia solani Kuhn. and Sclerotium rolfsii Sacc. are occurred due to pre- and post-emergence damping off diseases. Garlic, jojoba and marjoram plant extracts with different concentrations (1.5, 3.0 and 6.0%) caused reduction in growth of the tested fungi in vitro. Reduction in growth of R. solani was significantly higher than in S. rolfsii.
All plant extracts with different concentrations reduced the incidence of pre- and post-emergence damping off and increased the crop parameters under greenhouse conditions. Concentration 3% was the most effective one. Garlic and jojoba were the most effective extracts when used at concentration 3% where they the highest plant stand and the best yield components in comparison with the control.
Using garlic extract under field conditions as seed treatment at the concentration 3% significantly reduced disease incidence and also increased the percentage of yield components, i.e. the number and weight of pods/plant and dry weight of 100 seeds followed by jojoba extracts during the two successive growing seasons 2008 and 2009. On the other hand, marjoram showed the lowest effect in comparison with the control.

Key words: Bean, control, garlic, jojoba, marjoram plant extracts, Rhizoctonia solani, Sclerotium rolfsii, damping off, root rot diseases.
Reference:-
Soliman, N.K; Saber, M.M. and Ahmed, M.F.A (2013): Evaluation of some plant extracts on controlling damping off and root rot diseases of bean (Phaseolus vulgaris L.). Egypt. J. Phytopathol., Vol. 41, No. 1, pp. 1-220 (2013).