STUDIES ON FUSARIUM WILT OF BELL PEPPER (Capsicum annuum L.)
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Date
2016
Authors
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Publisher
UHF,NAUNI,SOLAN
Abstract
ABSTRACT
The present investigation entitled “Studies on Fusarium wilt of bell pepper (Capsicum
annuum L.)” was conducted in the laboratories and experimental farm of the Department of Plant
Pathology. During the survey of the disease, 20-53 per cent incidence of wilt was recorded in Solan
and Sirmaur districts of Himachal Pradesh. Pathogenicity test was conducted on 35-40 days old
seedlings of bell pepper and incubation period of 240 h was recorded. Effect of different temperature
and pH levels on mycelial growth of pathogen were studied under in vitro conditions and optimum
mycelial growth was observed at temperature of 25°C and pH 7.0. Studies conducted under pot
culture conditions, revealed that soil temperature of 25°C and 40 per cent of soil moisture level were
best for the disease development. Among different systemic and non-systemic fungicides tested under
in vitro conditions, carbendazim at 50, 100, 150 ppm and tebuconazole + trifloxystrobin at 500 ppm
were found most effective and resulted in complete mycelial growth inhibition. Under field
conditions, soil drenching of carbendazim (0.2 %), carbendazim + mancozeb (0.25 %) and
tebuconazole + trifloxystrobin (0.1%) were found most effective and increased fruit yield. Among
different SAR inducers evaluated under pot culture conditions, seedling dip treatment of acibenzolar-
S- methyl at 0.05 mM for 45 minutes was found most effective in managing the disease and also
increased healthy leaves percentage, plant weight and height of plants. Seedling dip treatment of β-
amino-butyric acid was also found effective followed by salicylic acid and resulted in 85 and 64 per
cent disease reduction, respectively and also increased plant growth parameters. Seedling dip
treatment of acibenzolar-S- methyl (0.05 mM) and β- aminobutyric acid (1 mM) under field
conditions were found effective and reduced disease incidence to 80 and 73 per cent as well as
resulted fruit yield of 15.50, 14.50 kg/plot respectively. Nickel and cobalt nanoparticles which were
evaluated under in vitro conditions, nickel nanoparticles followed by cobalt at 500 ppm concentration
were found effective and resulted in 89 and 87 per cent mycelial growth inhibition respectively.
Under pot culture conditions, nickel and cobalt nanoparticles at 400 ppm concentration were most
effective and gave hundred per cent disease reduction.
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