Biological control of root rot of Cucumber  by a Rhizoctonia solani

	Biological control of root rot of Cucumber by a Rhizoctonia solani
journal of kerbala university
Article 1, Volume 11, Issue 0, 2015, Pages 60-71 PDF (0 K)
Abstract
This experiment was conducted to assess the activity and efficiency of Pseudomonas fluorescens bacteria and the bio controlling fungi Glomus intradices and Trichoderma harzianum in the protection of Cucumber plant from R. solani and its impact growth traits under lathhous and field conditions. Results showed that , each insolation of the infected roots contained R. solani of cucumber plants from different regions of the province of Babylon ,leading to reduction of germination percent in comparison with the control treatment in which germination percent reached 99%.the R. solani isolate caused zero percent of germination . Results also indicated that, P.fluorescens + Glomus intradces and. P.fluorescens + T.harzianum and Glomus intradces + T.harzianum gave protection for Cucumber seedlings at 28 days of infection isolated pathogenic fungus R.s2 conditions under lathhous conditions where the infection intensity reached 18.75% and 12.5 % and 25%, respectively, compared with the control of the pathogenic fungus alone, which amounted to 87.5%.The same treatment under field conditions in the presence of pathogen fungus caused a reduction of the infection intensity by 16.25% and 11.25% , 13.00%, respectively ,as compared to the control treatment of the pathogenic fungus alone, 92.00% and a significant increase in the fresh and dry weight and lengths of root and shoot systems of cucumber plants .The for treating with the bacterium P.fluorescens + T.harzianum hare fungus caused the best result of lathhous and field conditions .All treatments on the other hand , increased significantly the fresh and dry weights and length of root and shoot systems as compared to the treatment with R.solani (R.s2) alone that causes Cucumber root rot.

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