Utpal Dey

Cotton Mosaic: Tobacco Streak Virus Utpal Dey

The naturally field infected plants showing good symptoms are also difficult to identify in lateral stage of plant. Because they disappear with time. The virus is very easily sap transmissible. The virus is found to be transmitted by Thrips palmi and Thrips tobacci in persistent manner. No seed transmission is observed. Virus showed same physical properties as it shows in stem necrosis of peanut or sunflower necrosis disease. The physical properties are found to be thermal inactivation point (TIP) 55?600C, dilution end point (DEP) 10-2 -10-3 and longevity in vitro (LIV) 5 Hrs, virus infecting nineteen of different host plants are identified belonging to five different types of families viz.malvaceae, chenopodiaceae , compositae ,leguminaceae and solanaceae. However they found to produce same types of symptoms as in most of the host that have been tested before. In ELISA test report it is found that the virus showing positive test only with anti serum of TSV of a cowpea and cotton.