“Studies on Cephaleuros virescens Kunze causing red rust of litchi”
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Date
2021-10-01
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College of Horticulture and Forestry Neri, Hamirpur (H.P.)
Abstract
The present investigation entitled ―Studies on Cephaleuros virescens Kunze
causing red rust of litchi‖ was undertaken to record the prevalence of the disease,
cultural and epidemiological aspects of the pathogen and management of the
disease. Red rust of litchi was prevalent in mild to severe form at various
locations in five districts (Hamirpur, Una, Kangra, Chamba and Mandi) surveyed
in Himachal Pradesh. Disease incidence was found to be ranging from 0 to 35.47
per cent with disease severity 0 to 47.79 per cent. Maximum incidence and
severity of disease was recorded at Nagrota Bagwan, Kangra. The pathogen was
isolated, purified and identified as Cephaleuros virescens. Pathogenicity of the
isolated pathogen was proved by inoculating healthy litchi leaves with culture of
pathogen consisting of zoosporangia and the symptoms appeared after 2 weeks of
second inoculation. Out of six nutrient media tested, agarized host leaf extract
medium was found to be best for growth of C. virescens. Gametangia like bodies
were visualized in the culture. Temperature of 25℃ and pH 8.5 incubated under
12 h photoperiod was found to be optimum for the growth of pathogen.
Temperature 32℃ and relative humidity 100 per cent was found to be optimum
for symptom development under artificial inoculation conditions. Captan,
mancozeb, CabrioTop®, hexaconazole and propiconazole resulted in cent per cent inhibition of alga.