STUDIES ON FOOT ROT COMPLEX OF BETELVINE (Piper betle L.)
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Date
2017-06
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UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT
Abstract
Survey was carried out during 2016-17 which revealed that the disease incidence
ranged from 5-92 per cent in different parts of northern Karnataka. Maximum incidence
was recorded in Haveri (67.46 %) district followed by Bagalkot (62.91 %) and the least
per cent disease incidence (28.06 %) was recorded in Belagavi. The causal agents of
foot rot complex were confirmed through pathogenicity test, cultural, morphological
and molecular identification as Phytophthora parasitica and Sclerotium rolfsii.
Among 10 solid media tested, czapeck dox agar (86.50 mm) supported for
highest growth of the fungus P. parasitica at eight days of incubation followed by
sabouraud’s agar (85.30 mm) and the minimum growth of the pathogen was recorded in
malt extract agar (41.70 mm). L-asparagine and potassium nitrate were found to be best
carbon and nitrogen sources for the growth of the fungus respectively. The highest
growth of P. parasitica was recorded at the optimum temperature 20 oC, pH 8 and RH
90 per cent.
Whereas in case of S. rolfsii czapek’s dox agar (88.20 mm) supported for highest
growth of the fungus followed by oat meal agar (86.70 mm) after seven days of
incubation and minimum growth (42.70 mm) of the pathogen was recorded in V-8 juice
agar. Glucose and calcium nitrate were found to be best carbon and nitrogen sources for
the growth of the fungus respectively. The highest growth of S. rolfsii was recorded at
the optimum temperature 30 °C, pH 5 and RH 90 per cent.
Treatments metalaxyl + mancozeb 78 WP (3 g/l @ 2 l/vine) or enriched FYM
with Trichoderma harzianum (@ 2 kg / vine) + Pseudomonas fluorescens (@ 10 g/vine)
or enriched FYM with Trichoderma harzianum (@ 2 kg / vine) + Pseudomonas
fluorescens (@ 10 g/vine) + neemcake (@ 1 kg/vine) or Bordeaux mixture (1%) @ 2
l/vine recorded highest reduction of the disease with maximum yield.
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