STUDIES ON VIRAL DISEASES OF POTATO WITH REFERENCE TO EPIDEMIOLOGY AND MANAGEMENT
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Date
2000
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University of Agricultural Science, Dharwad
Abstract
"Potato is one of the most important commecial vegitable crops cultivated in
Kamataka Among the viral diseases mosaics and leaf roll are most common. The survey
was conducted during kharif 1999 and summer 2000, the incidence of viral diseases was
ranged from 4.20 to 66.75 per cent. Incidence of severe mosaic ranged from trace to
36.00 per cent and leaf roll incidence ranged from 4.20 to 40.75 per cent in both Hassan
and Kolar districts, whereas mild mosaic incidence was not noticed in both the districts
The. mild mosaic virus (PVX) was sap transmissible to different indicator plants
and produced systemic symptoms on tobacco, Micotiana glutinosa, tomato and Capsicum
annuum and local lesions on cowpea, beans, Gomphrena glohosa and Chenopodtum
amaranticolor. Severe mosaic virus (PVY) produced systemic symptoms on tobacco,
Nicotiana tabacum var. white burley and samsun, Nicotiana glutinosa, Datura metel,
Nicandra physaloids. Petunia hyhrida and Capsicum annuum and local lesions on
Chenopodium amaranticolor. The mild mosaic, severe mosaic and leaf roll viruses were
transmitted through seed tubers. Aphids {Myzus persicae) transmitted severe mosaic and
leaf roll viruses in a non-persistent and persistent manner, respectively.
The mosaics had slight effect on yield and yield parameters, whereas the leaf roll
infection at early stages resulted in greater yield loss than later stages infection. The
lower disease incidence and the higher tuber yield was obtained in early planted crop
(June 1st to June 21st) than late planted crop, therefore the spread of diseases could be
minimised by adopting early planting Mulching with polyethylene sheet and aluminium
foil immediately after emergence resulted in reduction of severe mosaic and leaf roll
diseases incidence.
In tissue culture studies, maximum number of PVY free potato plantlets were
obtained by meristem-tips obtained from seedlings of true potato seeds (94.44) than that
of severe mosaic (PVY) infected plants (69.44%)."
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No. of references 147