Early blight of potato
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This document summarizes early blight of potato, a disease caused by the fungus Alternaria solani. It affects potatoes worldwide, especially in hilly areas, and can cause losses of 20-50% of potato crops. Symptoms include greenish-blue spots on lower leaves that later turn brown with concentric rings. The disease spreads from infected plant residues or seeds and favors temperatures of 28-30°C. Management strategies include removing plant residues, rotating crops every 2 years, and spraying fungicides like Zineb or Kavach at 10-15 day intervals. Resistant potato varieties also help control the disease.
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Early blight of potato
- 1. EARLY BLIGHT OF POTATO DR. RAJBIR SINGH Assistant Professor Department of Plant Pathology Gochar Mahavidyalaya, Rampur Maniharan, Saharanpur (UP), India Affiliated to Ch. Charan Singh University, Meerut (UP), India Email: rajbir25805@yahoo.com, rajbirsingh2810@gmail.com Cell No. 91-9456613374
- 2. Early Blight of Potato • Disease is world wide • In India – Assam, Tripura, , West Bengal, Bihar, UP, UK, Haryana, Punjab, HP etc. • More in hilly area • Loss- till 20-50%
- 3. Symptoms • Appear before late blight after 4- 5 weeks of sowing • Lower leaf first affected & scattered spots • Covered with greenish blue growth of fungus • Later spots – brown & concentric rings
- 4. • Chlorosis due to alternaric acid • Leaf falling • Black to brown spots on stem • Branches or plant die • Rotting in tubers • Tubers less & small • Starch lacking in tuber
- 13. Pathogen – Alternaria solani • Weak pls. more susceptible • Disease is soil & seed borne • Pathogen survive as conidia & mycelium in seed & plant residues • Collateral host – tomato etc. • Fav. - Tem. - 28 - 30° C for conidia germination • R. H. – high
- 14. Systemic Position Kingdom – Mycota/ Fungi Division – Eumycota Sub division – Deuteromycotina Class – Hypomycetes Order – Hypomycetales Family – Dematiaceae Genus – Alternaria Species - solani
- 15. Conidia of Alternaria solani
- 16. Disease Management • Removal of pl. residues • Crop rotation – 2 yrs. • Spray – Zineb (Dithane M- 45) @ 0.25% or Kavach 75 WP @ 0.2% at 10 – 15 days interval • Dis. Res. Var.- Kuphri Alankar, Kuphari Naveen, K. Jeevan, K. Sinduri
- 17. THANK YOU