1. TOBACCO MOSAIC
DR. RAJBIR SINGH
Assistant Professor
Department of Plant Pathology
Gochar Mahavidyalaya, Rampur Maniharan, Saharanpur (UP), India
Affiliated to Ch. Charan Singh University, Meerut (UP), India
Email: rajbir25805@yahoo.com, rajbirsingh2810@gmail.com
Cell No. 91-9456613374
2. Tobacco Mosaic
⢠All over the world
⢠All states of country
⢠150 spp. affected, Tobacco, tomato, potato, brinjal etc.
⢠Most destructive in tobacco & tomato
⢠Quality & quantity reduced
⢠Quality loss â till 33%
⢠Quantity loss âtill 50%
3. Symptoms :
⢠First appear on new leaves
⢠Mottling
⢠Greening & yellowing of leaves
⢠Green parts - normal growth
⢠Yellow parts â growth stop
⢠Result â green parts form pits
⢠If infection in early stage - leaf twist & malformed
⢠Old leaves â yellow parts â brown
⢠Partial sterility in pollens
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12. Pathogen â Tobacco mosaic virus /
Nicotiana virus 1
⢠Rod shaped
⢠Size â 300 nm long
⢠Diameter â 15 -18 nm
⢠Sap transmissible â by wounds
⢠Seed transmission in tomato but not in tobacco
⢠No insect vector is known
⢠Mechanical transmission