STUDIES OF BETELVINE MOSAIC
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Date
1989
Authors
Journal Title
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Publisher
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.
Abstract
Mosaic dis~ase of betelvine Piper betle L.) was
characterised by mild vein-·clearin·g ,gradually developing into
interveinal chlorosis resulting in mosaic pattern. The
infected plants also showed leaf distortions and stunted
growth. At severe stages of infection the emerging leaves
became completely yellow.
The virus was readily transmitted by sap inoculation
with an incubation period ranging between 17 to 21 days It
was also transmitted through stem cuttings and approach
grafting. The virus was found to produce necrotic local
lesions on ~oybean ( Glycine max )
The virus had a longevity 1D vitro of 11 h at room
temperature . dilution end point of 1o-4 and thermal
inactivation point of 5~ C.
Purification of mosaic affected leaves showed mixed
infection containing isometric particles 25 nm in diameter
and rod shaped particles of very small size at 60.000
magnification.
Histopathological changes induced in the leaf of a
virus infected betelvine plant showed poor development
of mesophyll and parenchyma. The midrib was smaller. xylem
and phloem strands were under developed .
On secreening varieties for phenol and essential oil
content it was observed, pungent varieties Godibangla
Gachipan. karapaku and Bangla (resistant varieties)
higher phenol and essential oil content compared to non
.
pungent commercial varieties Tellaku-Nandyal and Tellaku-
Ponnur (susceptible varieties).
The rate of spread of mosaic disease in an infected
garden from a diseas~d plant to healthy one was faster in the
J
i
initial stages of infection and gradually decreased with
progress of time . The incidence and spread of mosaic
disease was influecned by weather t~ctors. There was a
positive correlation of percentage of disease with maximum
temperature and soil moisture in both the gardens and a
negative corr ·elation with pH was observed in the second
garden .
Description
Keywords
Studies, betelvine, mosaic