Antagonistic effects of Trichoderma spp. in the control of Sclerotinia sclerotiorum and in comparison with chemical fungicides

Document Type : Research Paper

Authors

Abstract

Sclerotinia sclerotiorum (Lib.) de Bary is a major plant pathogen that plays a crucial role in yield reduction of economically important crops. Most of the conventional methods are not effective in management of S. sclerotiorum. The Biological control by fungal antagonists could be useful in reducing disease. In the present research, antagonistic effects of indigenous Trichoderma species on S. sclerotiorum were determined in vitro. Dual culture technique, production of volatile and non-volatile compounds were used to determine the percentage of mycelial growth inhibition. The mycelial growth inhibition of S. sclerotiorum by Trichoderma strains ranged from 35.5-53.4, 0-33 and 0-100 percent in dual culture, volatile compounds and non volatile metabolites tests, respectively. Trichoderma harzianum (A10) showed the highest impact on mycelial growth inhibition in dual culture and T. harzianum (A2 & A10) had the highest effect on the inhibition of mycelial growth by the production of volatile compounds and non-volatile compounds. On the whole, antagonist T10 (T. harzianum) was most effective in controlling pathogen isolates under laboratory conditions. Also effects of three fungicides including thiophanate- methyl, Rovral TS and Benomyl were studied in laboratory conditions. Results showed that thiophanate-methyl (10 ppm) and the other two fungicides at concentration of 100 ppm were able to completely inhibit the mycelial growth. Comparison of effectiveness of chemical and biological control methods in greenhouse conditions indicated that inoculation of soil with antagonist prior to infection with the pathogen had better effect than chemical control did. This study has shown that the use of biocontrol agents at the right time is more efficient in prevention of the disease than chemical fungicides.

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References

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