THE EFFECIENCY OF SOME PLANTS EXTRACTS AND BIOAGENTS AGAINST Rhizoctonia solani KUHN CASUSING AGENT OF CROWN AND ROOTT ROT DISEASE ON COTTON | ||
| Euphrates Journal of Agriculture Science | ||
| Article 1, Volume 6, Issue 2, April 2014, Pages 213-223 | ||
| Abstract | ||
| Abstract: The aims of the present study are to isolate and Identify the main fungi associated with crown and root rot disease on cotton plant in Babylon province , antagonistic abilities of the some pant extracts and bioagents against of pathogen under laboratory conditions. the result showed the distribution of the disease in all fields in percentage of disease incidence 40-100% and severity 15-75%. The results of isolation and Identification showed that fungus Rhizoctonia solani is presented in the most samples they isolates were identified up to the genus and species level ,the Identification is based on their cultural and morphological characteristics. The test of pathogencity of R. solani isolates showed that isolates were effect on cotton seed germination percentage, which was between 0.0-70.0%, compared to the control 95.0 %. Results showed that the pathogenic isolates caused significant reduction in stem height, wet and dry weight by increase percentage of disease incidence and severity. The effect of plant extracts on R. solani growth was different with different concentrations caused significant inhibition in growth rate of R. solani. The 10% concentration of Common Bugloss. (Anchusa officinalis) and Black Cumin (Nigella sativa) inhibited the fungal growth to 5.7 and 6.7cm and inhibit percentage 37.0 and 25.9% respectively whereas, the Fenugreek (Trigonella foenum), extract was less effect on fungus growth in the same concentration. T. harzianum fungus had highly antagonistic ability followed by Aspergillus niger and Penicillium spp. against the pathogenic isolate of R. solani on medium. | ||
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