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Blast of rice

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Dr. Rajbir Singh
Dr. Rajbir Singh

This document provides information about blast disease of rice, including its history, symptoms, causal pathogen, disease cycle, and management strategies. It notes that blast disease was first seen in Japan in 1704 and caused 75% loss in Tanjavur, India in 1913. Symptoms include water-soaked lesions on all plant parts except roots. The pathogen is Pyricularia oryzae, which can survive for 1-2 years in plant residues and weeds. Disease management involves using healthy seed, seed treatment, removing weeds, balanced fertilization, and fungicide sprays at tillering and flowering stages. Resistant varieties include IR-64, Pant Dhan-16, and Pant Dhan Sank

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BLAST OF RICE 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
BLAST OF RICE • 1704 - Seen in Japan • 1913 – Tanjavur by Butler • Loss – 75% • Symptoms: • All parts except root infected • Appeared in Nursery • Boat Shaped water soaked spots of > 0.5 mm long
• Corner of spot – dark brown red • Middle – white grey / ash color • Spots enlarge & collapse – leaf blightning • Neck Infection / Neck Rot Phase (most dangerous) • Black grey mycelium on the neck • No grain formation/ partial formation
Blast of rice
Blast of rice
Blast of rice
Blast of rice
Blast of rice
Blast of rice
Blast of rice
Blast of rice
Blast of rice
Pathogen – Pyricularia oryzae P. grisea (Imperfect stage) Magnaporthe grisea (Perfect stage) • Survive in seed & plant residues • Mycelium survive in puwal – 1-2 years • Survive on weeds – Penicum repens, Digitaria marginata • R. H. – 90% • Tem. – 20-25° C
Systemic Position Kingdom – Mycota/ Fungi Division – Eumycota Sub division – Deuteromycotina Class – Hypomycetes Order – Hypomycetales Family – Dematiaceae Genus – Pyricularia Species - grisea
Conidia of Pyricularia gresia
• Reproductive structures - (1). Conidia – Pear shaped with 2 septa (2). Chlamydospore (3). Sclerotium • Toxin - (1). Pyricularin (2). ά– Picolinic acid • Enzyme - (1). Pectinolytic enzyme
Disease cycle
Disease Management • Use healthy seed • Seed treatment – Tricyclazole or Beam 75 WP - @ 4 gm/ kg seed • Removal of weeds • Use balance fertilizers – no heavy use of N2 • Spray - (i). Beam @ 6 gm/litre or (ii). Bavistin – 0.1 % First spray - tillering stage IIend spray – flowering stage (iii). Contaf – 0.2 % • Dis. Res. Var. - IR- 64, Pant Dhan-16, Pant Dhan Sankar - 1
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Blast of rice

  • 1. BLAST OF RICE 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. BLAST OF RICE • 1704 - Seen in Japan • 1913 – Tanjavur by Butler • Loss – 75% • Symptoms: • All parts except root infected • Appeared in Nursery • Boat Shaped water soaked spots of > 0.5 mm long
  • 3. • Corner of spot – dark brown red • Middle – white grey / ash color • Spots enlarge & collapse – leaf blightning • Neck Infection / Neck Rot Phase (most dangerous) • Black grey mycelium on the neck • No grain formation/ partial formation
  • 13. Pathogen – Pyricularia oryzae P. grisea (Imperfect stage) Magnaporthe grisea (Perfect stage) • Survive in seed & plant residues • Mycelium survive in puwal – 1-2 years • Survive on weeds – Penicum repens, Digitaria marginata • R. H. – 90% • Tem. – 20-25° C
  • 14. Systemic Position Kingdom – Mycota/ Fungi Division – Eumycota Sub division – Deuteromycotina Class – Hypomycetes Order – Hypomycetales Family – Dematiaceae Genus – Pyricularia Species - grisea
  • 16. • Reproductive structures - (1). Conidia – Pear shaped with 2 septa (2). Chlamydospore (3). Sclerotium • Toxin - (1). Pyricularin (2). ά– Picolinic acid • Enzyme - (1). Pectinolytic enzyme
  • 18. Disease Management • Use healthy seed • Seed treatment – Tricyclazole or Beam 75 WP - @ 4 gm/ kg seed • Removal of weeds • Use balance fertilizers – no heavy use of N2 • Spray - (i). Beam @ 6 gm/litre or (ii). Bavistin – 0.1 % First spray - tillering stage IIend spray – flowering stage (iii). Contaf – 0.2 % • Dis. Res. Var. - IR- 64, Pant Dhan-16, Pant Dhan Sankar - 1