CONSERVATION OF CHILLI BIODIVERSITY THROUGH ECOFRIENDLY MANAGEMENT OF ANTHRACNOSE
KrishiKosh
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Title |
CONSERVATION OF CHILLI BIODIVERSITY THROUGH ECOFRIENDLY MANAGEMENT OF ANTHRACNOSE
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Creator |
NARENDRA VARMA, K
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Contributor |
ANITHA, K
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Subject |
sowing, diseases, planting, chillies, extraction, biological phenomena, plant extracts, fruits, application methods, fungi
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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. |
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Date |
2016-06-23T10:44:38Z
2016-06-23T10:44:38Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/67813
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Language |
en
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Relation |
D9151;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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