This PPT includes Introduction, symptoms, causal organism, life cycle and management of damping off of vegetables.

1. DAMPING OFF OF VEGETABLES
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. Damping off of Tobacco
1. High tem Pathogen
2. Soil drying
3. Excess salt
4. Water logging
5. Bed aeration
6. Chilling
• Occur in the area where moisture is more
• Losses – upto 100%

3. Symptoms
1. Pre-emergence
Seed fail to emerge
infected seed- soft, discolored
shrink and finally disintegrated
rotting under soil

4. 2. Post-emergence
Toppling of the infected seedling
Tissues become soft & water soaked
Stem become constricted & collapse

9. Pathogen or casual organism
Pathogens are soil-borne
aphanidermatum
• Pythium debaryanum
butlei
• Phytophthora spp.
• Fusarium spp.
• Sclerotium spp.
• Rhizoctonia spp.
• Alternaria spp.

10. Disease cycle
• Pathogens survive in the soil as Oospore
• Favorable conditions-
(i). RH- 90-100%
(ii). Tem. 20 o C
(iii). Compact and heavy soil – aeration
(iv). Overcrowding

12. • Enzymes secreted by pathogen
1. Pectinolytic
2. Proteolytic
3. Cellulolytic

13. Management of the disease
1. Thin sowing of seed
2. Light soil
3. Nursery bed should be raised
4. Well drainage
5. Steam sterilization of the soil
6. Soil solarization- for 40-60 days with 300-
400 gauze polithene
7. Seed treatment with
• Thiram -2.5 gm/kg seed
• Captan – 2.5 gm/kg seed
• Apron – 4 gm/kg seed

14. 8. Soil sterilization –(i). Formalin dust
15 parts formalin + 85 parts charcoal
@100gm/sq. M
Mix. – 3-4 inch in soil
(ii). Thiram, Copper oxychloride
@3 gm/Sq. M
9. Spraying- (i). Ridomil- 1 gm/litre
(ii). Blitox- 50- 2.5 gm/litre
(iii). Difolatan- 2 gm/litre
(iv). Captan, Dithane Z- 78, Thiram-2-3 gm/litre
10. (i). Tricoderma spp.
(ii). Pencillium oxalicum
(iii). Tricoderma virens

15. Thank You