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LATE BLIGHT OF POTATO
DR. RAJBIR SINGH
Assistant Professor
Department of Plant Pathology
Gochar Mahavidyalaya, Rampur Mani...
Late Blight of Potato
All potato growing areas of the world
The disease was reported:
• 1830 - 40 - Andies (Europe & USA)
...
Symptoms
• Disease appear at flowering or
any stage
• Water soaked, light yellow /
light green spots
• On lower leaves - b...
• If environment is dry-
• Tan colour spot appear
• In moist season – blue,
grey mycelium
• Growth – conidiophore
• After ...
(1). Wet rot –(i). water secretion
(ii). white growth
(iii). 25 - 45 mm rotting in tuber
(iv). whole potato rot
(2). Dry r...
Pathogen – Phytophthora infastans
• Survival - not in Indian plain due to high tem.
• Primary source of inoculum – seed in...
Systemic Position
Kingdom – Mycota/ Fungi
Division – Eumycota
Sub division – Mastigomycotina
Class – Oomycetes
Order – Per...
Sporangia of P. infestans
Sporangia of P. infestans
Factors responsible for epidemic
• Night tem. for 4 hrs - below dew point
• Minimum tem. - 10° C
• Cloudness
• Rain for ne...
Life cycle
Disease Management
1. Use of healthy seed
2. Removal of plant debris (field sanitation)
3. Removal of weeds
4. Harvesting ...
8. Balanced fertilization of N22 & proper irrigation
9. Seed treatment- Ridomil 5% dust -1kg/100 kg seed
10. Storage at 3....
Thank You
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
Late blight of potato
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Late blight of potato

The PPT describe the introduction, symptoms, pathogen favorable conditions for epidemiology and management of late blight of potato

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Late blight of potato

  1. 1. LATE 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. 2. Late Blight of Potato All potato growing areas of the world The disease was reported: • 1830 - 40 - Andies (Europe & USA) • 1843 - Ireland, England & all Europe • 1845 - 46 - Irish Famine • 1870 - 80 - Nilgiri hills • 1943 – Meerut (UP), India • Economic loss - till 65%
  3. 3. Symptoms • Disease appear at flowering or any stage • Water soaked, light yellow / light green spots • On lower leaves - brownish black lesion • Leaf blighted • If temp. is favorable - than cover whole leaf & • Plant in 1-4 days and plant parts rotted
  4. 4. • If environment is dry- • Tan colour spot appear • In moist season – blue, grey mycelium • Growth – conidiophore • After leaf falling- rotting in tubers
  5. 5. (1). Wet rot –(i). water secretion (ii). white growth (iii). 25 - 45 mm rotting in tuber (iv). whole potato rot (2). Dry rot - (i). bluish/black growth (ii). inner side reddish brown (iii). 5 -15 mm rotting in tuber • Smell from the infected field
  6. 6. Pathogen – Phytophthora infastans • Survival - not in Indian plain due to high tem. • Primary source of inoculum – seed in storage • Hills – plant debrish • Colletral host - (i). Solanum nigram (ii). Datura (iii). Stramonium etc.
  7. 7. Systemic Position Kingdom – Mycota/ Fungi Division – Eumycota Sub division – Mastigomycotina Class – Oomycetes Order – Pernosporales Family – Pythiaceae Genus – Phytophthora Species - infestans
  8. 8. Sporangia of P. infestans
  9. 9. Sporangia of P. infestans
  10. 10. Factors responsible for epidemic • Night tem. for 4 hrs - below dew point • Minimum tem. - 10° C • Cloudness • Rain for next 24 hrs - at least 0.1mm
  11. 11. Life cycle
  12. 12. Disease Management 1. Use of healthy seed 2. Removal of plant debris (field sanitation) 3. Removal of weeds 4. Harvesting in dry season 5. Harvesting after ripining 6. Remove upper portion before 15 days of harvesting 7. Earthing- 10-15 cm
  13. 13. 8. Balanced fertilization of N22 & proper irrigation 9. Seed treatment- Ridomil 5% dust -1kg/100 kg seed 10. Storage at 3.5 – 4.4° C 11. Spray- Mencozeb, Dithane Z- 78 - 2.5 kg/ha, 4-6 sprays – 14 days interval or Captafol 8% WP- 2.5 kg/ha, or Metalaxyal 280 gm A.I. + Mencozeb 1.8, 75 %WP (2.5 Kg/ha) – 10-15 days interval 12. Use resistant varieties – Kuphri Badhsaha, K. Alankar, K. Swarna, K. Jeevan, K. Jyoti etc.
  14. 14. Thank You

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The PPT describe the introduction, symptoms, pathogen favorable conditions for epidemiology and management of late blight of potato

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