Mycoparasitic action of some fungi on spot blotch pathogen (Drechslera sorokiniana) of wheat
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Authors
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SUDHAMOY MANDAL, K.D. SRIVASTAVA, RASHMI AGGARWAL and D.V. SINGH
Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi 110 012
Keywords:
Hyperparasite, fungi, biological control, spot blotch, wheatAbstract
Inhibitory effect of Trichoderma reesei [Trichoderma longibrachiatum], T. pseudokoningii, T. hamatum, Talaromyces flavus, Chaetomium globosum and Trichothecium roseum on mycelial growth of Drechslera sorokiniana [Cochliobolus sativus] was observed.Culture filtrates of these fungi inhibited conidial germination up to 92%. Soil application of antagonists enhanced the germination of Cochliobolus sativus inoculated wheat seeds and reduced browning on collar region of the seedlings caused by the pathogen. Foliar application of the culture filtrate of the antagonists reduced number of spot blotch lesions and protected green leaf area from drying due to infection. The antagonists mixed in soil showed beneficial effects on plant growth with enhanced rootand shoot weight over infected check. SEM micrographs showed lysis of host mycelium due to overgrowth and penetration through hyphal pegs and tight coiling produced by the antagonists.
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