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Valluvaparidasan, V.
- Management of Okra Powdery Mildew Using Ampelomyces quisqualis
Abstract Views :227 |
PDF Views:122
Authors
Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 23, No 3 (2009), Pagination: 325-327Abstract
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.Full Text
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.
- Seed-Borne Biocontrol Agents for the Management of Rice Sheath Rot Caused by Sarocladium oryzae (Sawada) W. Gams & D. Hawksw
Abstract Views :200 |
PDF Views:116
Authors
Affiliations
1 Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
1 Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 20, No 2 (2006), Pagination: 197-204Abstract
All the antagonist isolates obtained from rice seeds showed in vitro inhibitory effect on Sarocladium oryzae ranging from 10.90 to 82.18 per cent. Bacillus subtilis isolate 9 was found to be highly effective in inhibiting the mycelial growth of S. oryzae by 82.18 per cent. The biocontrol agents significantly reduced S. oryzae seed infection and increased seed germination and seedling vigour. Field trials conducted at four different locations indicated that the seed-borne S. oryzae in rice could be successfully managed by seed treatment followed by foliar application at boot leaf stage with B. subtilis (or) P. fluorescens.Keywords
Biocontrol Agents, Mycelial Growth, Rice Seeds, Sarocladium oryzae, Sheath Rot.Full Text