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CONSERVATION OF CHILLI BIODIVERSITY THROUGH ECOFRIENDLY MANAGEMENT OF ANTHRACNOSE

KrishiKosh

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Title CONSERVATION OF CHILLI BIODIVERSITY THROUGH ECOFRIENDLY MANAGEMENT OF ANTHRACNOSE
 
Creator NARENDRA VARMA, K
 
Contributor ANITHA, K
 
Subject sowing, diseases, planting, chillies, extraction, biological phenomena, plant extracts, fruits, application methods, fungi
 
Description Chilli anthracnose caused by Colletotrichum capsici is an important disease that
affects the yield and quality of produce drastically. It is essential to conserve chilli
biodiversity owing to its rich potential for export. Hence, attempts were made in the
present investigation to find out some environmentally safe and ecofriendly measures of
management of chilli anthracnose. Diverse chilli accessions consisting of Capsicum
annuum L (22) and C. frutescens (3) were evaluated for resistance against anthracnose
disease under laboratory and greenhouse conditions, taking “Pusa Jwala” as susceptible
check.
Chilli accessions were evaluated in the laboratory by standard blotter method,
and SBT -12549 (C. annuum) was found moderately resistant recording least per cent
seed surface covered by acervuli of C. capsici (13.23%). In the grow out test in seed
trays, EC391083 recorded least seedling mortality (23.33%), while pathogen inoculation
by spraying on seedlings under greenhouse conditions revealed that SBT-12549 (C.
annuum) as immune, followed by CA-960 (C. annuum) and SNTV-87 (C. frutescens)
as moderately resistant.
Six plant extracts were screened against C. capsici in vitro by poisoned food
technique and Pongamia seed oil was found effective in controlling the mycelial growth
with an inhibition of 80.15%, 83.58% and 84.15% followed by turmeric+garlic extract
(49.67%, 68.69%, 76.10%) at 30,50 and 100% concentrations respectively as compared
with carbendazim (83.60%) and hexaconozole (87.26%). The experiment on seed
treatment with plant extracts revealed that turmeric+garlic extract at all the
concentrations (30,50,and 100%) was found effective in minimizing the disease and
enhancing seed germination. Spraying of selected plant extracts on chilli seedlings
proved that four sprays of Pongamia seed oil (0.4%) at fortnightly interval were
effective in reducing the disease with a low PDI of 26.66 and 31.66% on two highly
susceptible accessions of EC599969 and SB-12693, respectively and is at par with the
chemical sprays of carbendazim (0.25%) and hexaconozole (0.1%).
xii
When the chilli plants sprayed with plant extracts/chemicals were analysed for
residues, it was found that samples from plant extract treatments were devoid of
residues, while samples sprayed with hexaconozole yielded in hexaconozole residues
upto 3.5 ppm.
From the above results, it can be suggested to use C. annuum accession, SBT-
12549, in breeding programmes for developing anthracnose resistant cultivars. While
selecting the seed for cultivation, care should be taken to procure the seed from disease
free areas in order to reduce the chances of occurrence of disease. During crop growth
period, on the onset of disease, four sprays of Pongamia seed oil (0.4%) can be
recommended instead of fungicides to combat the disease and also to obtain residue free
produce.
 
Date 2016-06-23T10:44:38Z
2016-06-23T10:44:38Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67813
 
Language en
 
Relation D9151;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY