Blast of rice. It's type and disease. Blast of rice. It's type and disease. Blast of rice. It's type and disease. Blast of rice. It's type and disease. Blast of rice. It's type and disease. Blast of rice. It's type and disease.

1. Blast of rice
Presented by: Sanu Kumari
MSc: 4th semester
Department of Botany

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
Division
Sub division –
Class
Order
Family
Genus
Species
–
–
–
–
-
– Mycota/ Fungi
– Eumycota
Deuteromycotina
Hypomycetes
Hypomycetales
Dematiaceae
Pyricularia
grisea

15. Conidia of Pyricularia gresia

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

17. Disease cycle

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

19. T h a n k Y o u