Journal of Biological Control

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Management of Okra Powdery Mildew Using Ampelomyces quisqualis


Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
 

The fungus Ampelomyces quisqualis is a naturally occurring hyperparasite of powdery mildews. Stanes Bio-Dewcon is a talc- based biological fungicide that contains the spores and mycelial fragments (1 x 108 CFUs g-1) of A. quisqualis. Bio-Dewcon at three different concentrations, viz., 2.0, 2.5 and 3.0kg ha-1 significantly reduced the okra powdery mildew incidence. The product was applied to plants as preventive spray at 30 and 45 days after sowing. Among the three doses tested, 3.0kg ha-1 was found to be on par with wettable sulphur (0.4%). Even though both Bio-Dewcon and wettable sulphur were found to be equally effective in controlling powdery mildew, Bio-Dewcon may be preferred due to its non-residual and odourless properties, especially in vegetables.

Keywords

Ampelomyces quisqualis, Bio-Dewcon, Foliar Spray, Okra and Powdery Mildew.
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  • Falk, S. P., Gadoury, D. M., Cortesi, P., Pearson, R. C. and Seem, R. C. 1995a. Parasitism of Uncinula necator cleistothecia by the mycoparasite Ampelomyces quisqualis. Phytopathology, 85: 794–800.

  • Falk, S. P., Gadoury, D. M., Pearson, R. C. and Seem. R. C. 1995b. Partial control of grape powdery mildew by the mycoparasite Ampelomyces quisqualis. Plant Disease, 79: 483–490.

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  • Management of Okra Powdery Mildew Using Ampelomyces quisqualis

Abstract Views: 230  |  PDF Views: 124

Authors

C. Gopalakrishnan
Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India
V. Valluvaparidasan
Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, India

Abstract


The fungus Ampelomyces quisqualis is a naturally occurring hyperparasite of powdery mildews. Stanes Bio-Dewcon is a talc- based biological fungicide that contains the spores and mycelial fragments (1 x 108 CFUs g-1) of A. quisqualis. Bio-Dewcon at three different concentrations, viz., 2.0, 2.5 and 3.0kg ha-1 significantly reduced the okra powdery mildew incidence. The product was applied to plants as preventive spray at 30 and 45 days after sowing. Among the three doses tested, 3.0kg ha-1 was found to be on par with wettable sulphur (0.4%). Even though both Bio-Dewcon and wettable sulphur were found to be equally effective in controlling powdery mildew, Bio-Dewcon may be preferred due to its non-residual and odourless properties, especially in vegetables.

Keywords


Ampelomyces quisqualis, Bio-Dewcon, Foliar Spray, Okra and Powdery Mildew.

References