Pathogenic variability of Pseudoperonospora cubensis in Gangetic Alluvial region of West Bengal,India |
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| Authors: | S. Hembram I. Bhattacharya A. Saha A. Chattopadhyay D. Majumder |
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| Affiliation: | 1. Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Nadia, India.;2. Department of Agricultural Meteorology, Bidhan Chandra Krishi Viswavidyalaya, Nadia, India.;3. AICRP on Vegetable Crops, Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Nadia, India.;4. Department of Agricultural Statistics, Bidhan Chandra Krishi Viswavidyalaya, Nadia, India. |
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| Abstract: | Cucurbits are tremendous economically important vegetable crops and extensively cultivated in tropical and subtropical part of the world during both rainy and winter seasons. Biotic stresses are of paramount importance in causing economic losses in cucurbits. Downy mildew, a foliar disease caused by an Oomycetes, Pseudoperonospora cubensis (Berk. & Curt.) Rostow, is one of the most destructive pathogens of cucurbits especially in wet and temperate regions, with worldwide distribution. Isolates of pointed gourd and ivy gourd showed no symptoms with most of the cucurbits hosts except pointed gourd and ivy gourd. P. cubensis isolate of pointed gourd differed from other isolates and may belong to different pathotype. The results of this investigation suggest that high variability of P. cubensis in terms of different pathotypes exists in the Gangetic Alluvial Region of West Bengal. Based on morphological characterisation, nine isolates of P. cubensis are grouped into four clusters by using hierarchical cluster analysis. |
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| Keywords: | P. cubensis downy mildew cucurbits pathogenic variability |
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