Epidemiology and management of anthracnose of bottlegourd caused by colletotrichum lagenarium (Pass.) ellis and halsted

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dc.contributor.advisorGupta, Anil
dc.contributor.authorBal Mukund
dc.date.accessioned2016-11-21T14:08:30Z
dc.date.available2016-11-21T14:08:30Z
dc.date.issued2006
dc.description.abstractIn epidemiological studies on the development of anthracnose of bottlegourd caused by Colletotrichum lagenarium emphasis was on the initiation and progression of the disease in relation to the weather variables and spore load in the field. The present study revealed that the severity of the disease increased with the increase in inoculum load and it was observed that spore concentration of 105 spore/ml produced maximum disease severity (31.05%). Age of the leaves also played an important role in the development of the disease as disease severity increased in leaves upto the age of 35 days thereafter it declined. Leaf wetness for 24 hours provided maximum disease severity (62.92%), whereas leaf wetness beyond 24 h had further no effect on severity. Relationship has also been worked out on spore population, weather parameters and disease development. Disease development was directly proportional to the spore production in the field. Further, temperature (maximum) in the range of 34-34.60C, temperature (minimum) 17.5-18.80C, relative humidity (morning) 82-92 per cent and relative humidity (evening) 29.6-47.7 per cent were congenial for both spore production and disease development. The regression coefficient of the disease severity and spore population with weather parameters revealed that temperature (minimum) and relative humidity (evening) are major contributing factors which could predict 88 of disease and 58 per cent of the spore population respectively. It was also seen that the observed values of disease intensity and spore population were close to the predicted value. The effect of bioagents on mycelial growth of Colletotrichum lagenarium by dual culture technique revealed that Trichoderma viride gave maximum inhibition of 59 per cent. Among various plant extracts evaluated for spore germination inhibition, neem leaf extract gave maximum 58.43 per cent inhibition. Similarly by poison food technique, neem extract gave maximum inhibitory effect on the mycelial growth (79.43%) of the fungus, which was at par with mancozeb at 0.1 per cent concentration. Under field condition foliar spray with neem leaf extract at 50% concentration gave significantly higher disease control (79.2%) as compare to control and it was at par with mancozeb (0.1%).en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/86669
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subPlant Pathology
dc.subjectBottlegourd, Anthracnose, Colletotrichum lagenarium,Epidemiology, Management, Plant extracts, Bioagentsen_US
dc.these.typeM.Sc
dc.titleEpidemiology and management of anthracnose of bottlegourd caused by colletotrichum lagenarium (Pass.) ellis and halsteden_US
dc.typeThesisen_US
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