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Studies on anthracnose - a postharvest disease of pappaya

KrishiKosh

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Title Studies on anthracnose - a postharvest disease of pappaya
 
Creator Vinod.Tasiwal
 
Contributor V.I.Benagi
 
Subject Plant pathology
 
Description Papaya (Carica papaya L.) an important tropical and subtropical fruit crop, is being
affected by several post-harvest diseases among which anthracnose caused by Colletotrichum
gloeosporioides (Penz.) Penz. & Sacc. Studies on C. gloeosporioides include isolation,
identification and proving pathogenicity test. The conidia were cylindrical or oblong, hyaline
and single celled with oil globules. Cultural studies revealed that among solid media, V-8
juice agar and oat meal agar were found to be good for radial growth and sporulation of C.
gloeosporioides and among the liquid media, Richard’s and Malt extract broth supported
maximum dry mycelial weight of C. gloeosporioides on 10th day of incubation.
Nutritional studies revealed that dextrose, potassium nitrate and magnesium sulphate
were better among the carbon, nitrogen and sulphur sources, respectively for growth,
sporulation and yielded maximum dry mycelial weight of the pathogen.
Physiological studies revealed that optimum pH of 6.5 was favourable for growth and
sporulation of pathogen. Maximum dry mycelial weight was obtained at optimum
temperature of 30ºC. Alternate cycles of 12hours light and 12 hours darkness favoured the
maximum radial growth and dry mycelial weight of C. gloeosporioides followed by
continuous light.
Under in vitro evaluation of botanicals, that Lantana camara and turmeric (5 and
7.5%) were found to be effective against C. gloeosporioides. Among the fungicides tested,
carbendazim was found to be cent per cent effective at all three concentration (0.05, 0.1 and
0.15%) and among the biocontrol agent Trichoderma virens was found to be effective
followed by T. koningii.
Under in vivo evaluation of salt, bioagents and hot water, the minimum per cent
disease index was observed in sodium chloride (5%) + hot water at 49º at 15 minutes. Among
the in vivo evaluation of fungicides, carbendazim was a superior at 0.1% and found to be a
least per cent disease index.
 
Date 2016-10-27T18:37:48Z
2016-10-27T18:37:48Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82618
 
Format application/pdf
 
Publisher UAS, Dharwad