Author： Indira S. Muthusubramanian V. Tonapi V. Varanavasiappan S. Seetharama N.
Publisher： Taylor & Francis Ltd
ISSN： 0323-5408
Source： Archives of Phytopathology and Plant Protection, Vol.39, Iss.5, 2006-10, pp. : 379-387
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Abstract
The scope of biocontrol agents in the control of sorghum grain molds was investigated both in vitro as well in vivo . Their utility in enhancing the germination and seedling vigor of mold-infected seeds were assessed. The biocontrol agents, Trichoderma viride, T. harzianum, T. hamatum, T. koeningii and Pseudomonas fluorescens (isolates collected from the state of Tamil Nadu, India) were efficient in checking the growth of mold pathogens when grown in Potato Dextrose Agar (PDA) as dual cultures. The bacterial bioagent P. fluorescens was most efficient in checking the growth of all the test pathogens viz ., Fusarium moniliforme , Curvularia lunata and Alternaria alternata (66.8, 68.5 and 64.9% inhibition of colony growth respectively) followed by other bioagents for their antagonistic effect. The in vivo effectiveness of the bioagents were enhanced when combined with other components like host-resistance, cultural and chemical control strategies, paving the way for a possible Integrated Disease Management. The percent incidence and severity of molds were lowest (19.44 and 13.5% respectively) with the treatment T 6 (seeds harvested at physiological maturity + propiconazole @ 0.02% + P. fluorescens @ 1 × 10 8 cfu ml −1 ) that recorded maximum 100 seed weight (2.905 g), followed by 2.871 g in T 2 (seeds harvested at physiological maturity + P. fluorescens ). The effect of bioagents in enhancing the germination and seedling vigor was most promising. Of all the treatments, P. fluorescens resulted in maximum germination (88%) and seedling vigor (2635.60 vigor index), followed by treatment with T. viride (86.6% and 2478.47 respectively).
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