Management of Okra Powdery Mildew Using Ampelomyces quisqualis


Affiliations

  • Tamil Nadu Agricultural University, Department of Plant Pathology, Coimbatore, Tamil Nadu, 641003, 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.

Subject Discipline

Agriculture Sciences

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References

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.

Paulitz, T. C. 2001. Biological control in green house systems. Annual Review of Phytopathology, 39: 103–133.

Singh, N. B., Sharma, H. K. and Srivastava, K. J. 1998. Chemical control of powdery mildew in okra seed crop. National horticultural Research and Development Foundation Newsletter, 18: 1–4.


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