Non-target effect of systemic fungicides on antagonistic microflora of Rhizoctonia solani
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Authors
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G. VIJI1, K. MANIBHUSHAN RAO and U.I. BABY2
1 Centre for Advanced Studies in Botany, University of Madras, Guindy, Madras 600 025
2 UPASI Tea Research Institute, Div. of Plant Pathology, Valparai Coimbatore 642 127
Keywords:
Non-target effect, antagonists, Rhizoctonia solani, systemic fungicidesAbstract
The response of the rice sheath blight pathogen, Rhizoctonia solani, and fungal antagonists, Gliocladium virens, Trichoderma longibrachiatum and T. harzianum to systemic fungicides was studied both in vivo and in vitro. The results indicated that the benzimidazole group of fungicides (carbendazim and benomyl) were toxic to the pathogen and the antagonists, while the organophosphorus fungicides (edifenphos and iprobenfos) were more toxic to the pathogen than the antagonists. The antagonists could tolerate 400μM of the organophosphorus fungicides compared with 4μM of the benzimidazole fungicides.
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