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Epidemiology and Integrated Management of Colocasia Blight

CSK Himachal Pradesh Agricultural University Repository

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Relation http://hillagricrepository.co.in/829/
 
Title Epidemiology and Integrated Management of Colocasia Blight
 
Creator Rana, Usha
 
Subject 635.2 Edible tubers and Bulbs
 
Description The present investigations on Colocasia blight were undertaken to study the mode of perpetuation of pathogen, factors affecting disease development and to work out suitable management strategies against the disease. Repeated microscopic examination of diseased plant parts and infested soil revealed the presence of mycelium, chlamydospores and oospores of the pathogen. Out of 24 Colocasia lines field evaluated for two years, none was disease free. However, two lines CE-7 and JC were categorized as moderately resistant. There was more disease incidence in May sown crop than June sown crop but the former yielded higher. Crop mulching with leaves and twigs of eupatorium reduced disease severity with significant increase in crop yield. Intercropping with maize reduced blight severity compared to pure crop. With an increase of nitrogenous fertilizers, corresponding increase in disease severity was observed. Higher doses of phosphorus and potassium decreased the blight severity. Systemic fungicides Ridomil MZ, Matco-8-64, Unilax, Curzate M8 inhibited mycelial growth of the pathogen. Among different botanicals, dried power of eupatorium inhibited mycelial growth of pathogen. Corm dip in Ridomil MZ @ 0.3% for one hour before sowing and three fortnightly foliar sprays of Ridomil MZ @ 0.25% managed the disease. Integration of corm dip in Indofil-M-45 for one hour, eupatorium mulch and three fortnightly foliar sprays of Ridomil MZ were found effective in reducing Colocasia blight severity with 76.9% disease control.
 
Date 2006
 
Type Thesis
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://hillagricrepository.co.in/829/1/Usha%20Rana.pdf
Rana, Usha (2006) Epidemiology and Integrated Management of Colocasia Blight. PhD thesis thesis, CSKHPKV Palampur.