Biological control of onion leaf blight disease by bulb and foliar application of powder formulation of antagonist mixture |
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| Authors: | M Karthikeyan K Radhika R Bhaskaran S Mathiyazhagan R Sandosskumar R Velazhahan |
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| Institution: | 1. Department of Plant Pathology, Center for Plant Protection Studies , Tamil Nadu Agricultural University , Coimbatore, 641 003, Tamil Nadu, India karthipath@rediffmail.com;3. Department of Soil Science and Agricultural Chemistry , Annamalai University , Annamalainagar, 608 002, Tamil Nadu, India;4. Coconut Research Station , Veppankulam, 614 906, Tamil Nadu, India;5. Department of Plant Pathology, Center for Plant Protection Studies , Tamil Nadu Agricultural University , Coimbatore, 641 003, Tamil Nadu, India |
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| Abstract: | Abstract Three antagonists: Pseudomonas fluorescens (Pf1), Bacillus subtilis and Trichoderma viride, were tested alone and in combination for suppression of onion leaf blight (Alternaria palandui) disease under glasshouse and field conditions. The average mean of disease reduction was 24.81% for single strains and 42.44% for mixtures. In addition to disease suppression, treatment with a mixture of antagonists promoted plant growth in terms of increased plant height and ultimately bulb yield. Though seed treatment of either single strain or strain mixtures alone could reduce the disease, subsequent application to root, leaves or soil further reduced the disease and enhanced the plant growth. The mixture consisting of Pseudomonas fluorescens Pf1 plus Bacillus subtilis plus Trichoderma viride was the most effective in reducing the disease and in promoting plant growth and bulb yield in greenhouse and field tests. |
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| Keywords: | Pseudomonas fluorescens Bacillus subtilis Trichoderma viride Alternaria palandui onion antagonistic mixture |
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