National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Downy mildew of grapes (Plasmopara viticola) is wide spread and most destructive disease of grapes (Vitis vinifera L.) worldwide. The disease has attained the status of a major disease of grape under Kashmir conditions. The characteristic symptoms observed were small pale yellow translucent spots approximately 0.3mm in size on adaxial leaf surface, which later on coalesced and formed irregular nectrotic patches surrounded by brown halo. On the corresponding abaxial surface, white cottony growth appeared which later turned dirty grey to dark brown ultimately resulted in premature defoliation. Infected shoot tips exhibited shepherds crook symptoms, dried up and droop and young infected berries turned brown, got covered with white cottony growth and withered later on. Whereas, late infected berries remained stunted, developed a purplish grey colour, shriveled and dropped. The tubular coenocytic hyphae produced tree like sporangiospores with four to six branches at right angles and hyaline, ellipsoid and papillated sporangia. The oospores were brownish, circular and germinates by single germ tube.
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