Early blight of potato
-
Upload
rajbir-singh -
Category
Education
-
view
398 -
download
20
Transcript of Early blight of potato
![Page 1: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/1.jpg)
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: [email protected], [email protected]
Cell No. 91-9456613374
![Page 2: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/2.jpg)
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%
![Page 3: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/3.jpg)
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
![Page 4: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/4.jpg)
• 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
![Page 5: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/5.jpg)
![Page 6: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/6.jpg)
![Page 7: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/7.jpg)
![Page 8: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/8.jpg)
![Page 9: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/9.jpg)
![Page 10: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/10.jpg)
![Page 11: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/11.jpg)
![Page 12: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/12.jpg)
![Page 13: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/13.jpg)
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
![Page 14: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/14.jpg)
Systemic Position
Kingdom – Mycota/ Fungi
Division – Eumycota
Sub division – Deuteromycotina
Class – Hypomycetes
Order – Hypomycetales
Family – Dematiaceae
Genus – Alternaria
Species - solani
![Page 15: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/15.jpg)
Conidia of Alternaria solani
![Page 16: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/16.jpg)
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
![Page 17: Early blight of potato](https://reader033.fdocuments.us/reader033/viewer/2022042422/5870fa041a28ab5f528b56b9/html5/thumbnails/17.jpg)
THANK YOU