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

Damping off of Tobacco

1. High tem Pathogen2. Soil drying3. Excess salt4. Water logging5. Bed aeration 6. Chilling

• Occur in the area where moisture is more• Losses – upto 100%

Symptoms1. Pre-emergence Seed fail to emerge infected seed- soft, discolored

shrink and finally disintegrated rotting under soil

2. Post-emergence

Toppling of the infected seedling Tissues become soft & water soaked Stem become constricted & collapse

Pathogen or casual organism

Pathogens are soil-borne

aphanidermatum• Pythium debaryanum butlei• Phytophthora spp.• Fusarium spp.• Sclerotium spp.• Rhizoctonia spp.• Alternaria spp.• Phoma spp.

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

• Enzymes secreted by pathogen

1. Pectinolytic

2. Proteolytic

3. Cellulolytic

Management of the disease1. Thin sowing of seed2. Light soil3. Nursery bed should be raised4. Well drainage5. Steam sterilization of the soil6. Soil solarization- for 40-60 days with 300-

400 gauze polithene7. Seed treatment with

• Thiram -2.5 gm/kg seed • Captan – 2.5 gm/kg seed

• Apron – 4 gm/kg seed

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

Thank You