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Blast of rice

This include introduction, symptoms, pathogen, life cycle and management of blast of rice.

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Blast of rice

  1. 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. 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. 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
  4. 4. 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
  5. 5. Systemic Position Kingdom – Mycota/ Fungi Division – Eumycota Sub division – Deuteromycotina Class – Hypomycetes Order – Hypomycetales Family – Dematiaceae Genus – Pyricularia Species - grisea
  6. 6. Conidia of Pyricularia gresia
  7. 7. • Reproductive structures - (1). Conidia – Pear shaped with 2 septa (2). Chlamydospore (3). Sclerotium • Toxin - (1). Pyricularin (2). ά– Picolinic acid • Enzyme - (1). Pectinolytic enzyme
  8. 8. Disease cycle
  9. 9. 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
  10. 10. Thank You

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