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 â 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 â 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
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13. Pathogen â Alternaria solani
⢠Weak pls. more susceptible
⢠Disease is soil & seed borne
⢠Pathogen survive as conidia & mycelium in
seed & plant residues
⢠Collateral host â tomato etc.
⢠Fav. - Tem. - 28 - 30° C for conidia germination
⢠R. H. â high
14. Systemic Position
Kingdom â Mycota/ Fungi
Division â Eumycota
Sub division â Deuteromycotina
Class â Hypomycetes
Order â Hypomycetales
Family â Dematiaceae
Genus â Alternaria
Species - solani