Md. Rahman-early Blight
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Presented By
Md. Shaifur Rahman Biotechn0ology & Genetic Engineering Discipline Khulna University Khulna-9208 Bangladesh Email: [email protected]
Title
Early Blight of Potato
Introduction Early
blight is a very common disease of potato and most important defoliating disease It is distributed worldwide The disease can cause in wide range of climatic conditions It is found in all potato growing regions and major in hot climates, especially in irrigated
Cause Alternaria solani
Symptoms Dark brown to black, concentric, isolated spots on leaflets Spots oval or circular in shape Old spots are dark brown, dry and brittle
Symptoms Leaves show considerable curling due to shrinkage of tissues Lower leaves are affected first They dry up and drop as disease progress upwards
Symptoms Spots may develop on stems Affected tuber develops small, sunken, more or less circular decayed lesions Tissues develop brown, corky, dry rot underneathss
Disease Cycle Pathogen
overwinters in crop residues and on seeds Penetrates into the host tissue directly. Conidia spreads by wind and to some extent by chewing insects
Disease Cycle
Factors Influencing Disease Development Optimum
temperature- 26-28⁰C Frequent rain and heavy dews Low fertility
Control Destroy
crop residues Crop rotation and field sanitation Spaying with Rovral or Dithane M 45 @ 0.2% at 10-15 days interval Cultivation of resistant varieties Moderately RV-Kufrisundary, Kufrinaveen, Kufrijeevan etc. Highly RV-hybrid from Solanum tuberosum x S. andizera
Conclusion Early
blight of potato poses a significant risk to productivity in field and tuber quality in storage In our country the disease is also very severe Early season application of fungicide, resistant variety and disease forecasting models can be used to predict the onset of the disease
Md. Shaifur Rahman Biotechn0ology & Genetic Engineering Discipline Khulna University Khulna-9208 Bangladesh Email: [email protected]
Title
Early Blight of Potato
Introduction Early
blight is a very common disease of potato and most important defoliating disease It is distributed worldwide The disease can cause in wide range of climatic conditions It is found in all potato growing regions and major in hot climates, especially in irrigated
Cause Alternaria solani
Symptoms Dark brown to black, concentric, isolated spots on leaflets Spots oval or circular in shape Old spots are dark brown, dry and brittle
Symptoms Leaves show considerable curling due to shrinkage of tissues Lower leaves are affected first They dry up and drop as disease progress upwards
Symptoms Spots may develop on stems Affected tuber develops small, sunken, more or less circular decayed lesions Tissues develop brown, corky, dry rot underneathss
Disease Cycle Pathogen
overwinters in crop residues and on seeds Penetrates into the host tissue directly. Conidia spreads by wind and to some extent by chewing insects
Disease Cycle
Factors Influencing Disease Development Optimum
temperature- 26-28⁰C Frequent rain and heavy dews Low fertility
Control Destroy
crop residues Crop rotation and field sanitation Spaying with Rovral or Dithane M 45 @ 0.2% at 10-15 days interval Cultivation of resistant varieties Moderately RV-Kufrisundary, Kufrinaveen, Kufrijeevan etc. Highly RV-hybrid from Solanum tuberosum x S. andizera
Conclusion Early
blight of potato poses a significant risk to productivity in field and tuber quality in storage In our country the disease is also very severe Early season application of fungicide, resistant variety and disease forecasting models can be used to predict the onset of the disease
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