FOR STUDY PURPOSE

2. SUBMITTED BY:-
NARAIN DHAR
[M.Sc.(Ag) 1st yr]
2016-17
SUBMITTED TO:-
Dr.D.PRATAP (SIR)
Dept- Genetics & Plant
Breeding

3. CONTENT
 INTRODUCTION
 HISTORY OF DISEASE
 DAMAGE CAPACITY OF DISEASE
 SYMPTOMS OF DISEASE
 ETIOLOGY
 DISEASE CYCLE
 DISEASE MANAGEMENT
 IDM APPROCHES

4. History Rice of Blast
 Disease of rice blast first recorded in 1704,in Japan.
 In India , disease was first recorded from Tanjore district
of Tamil Nadu in 1913.
 The causal organism was first detected by Cavara in 1891
from Italy & first leaf blast model was developed and
named as BLAST in japan.
 More Effected Varities of rice R-R 36, RASI
 Total Damage of Crops from Disease Generally 15-20%
but by S.Y Padmanabhan 75%,

5. SYMPTOMS
 All parts except root infected
 Appeared in Nursery small
 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

10. Etiology
 Causal Organism:- Pyricularia oryzae
or pyricularia grisea ( I.S)
Perfect stage :- Magnaporthe grisea
 Survive in seed & plant residues
 Mycelium survive in puwal – 1-2 years
 Survive on weeds – Penicum repens, Digitaria marginata
 Relative Humidity. – 90%
 Temperatue – 20-25°

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

12. Reproductive structures -
 (1). Conidia – Pear shaped with 2 septa
 (2). Chlamydospore
 (3). Sclerotium
• Toxin -
 (1). Pyricularin
 (2). ά– Picolinic acid
• Enzyme - (1). Pectinolytic enzyme

13. LIFE CYCLE OF DISEASE

14. MANAGEMENT OF DISEASE
 Use healthy seed
 Seed treatment – Tricyclazole or Beam 75 WP - @ 4 gm/ kg seed
 Removal of weeds (ROUGING)
 Use balance fertilizers – no heavy use of N2
 Spray - (i). Beam @ 6 gm/litre or
 (ii). Bavistin – 0.1 %
 First spray - tillering stage
Second spray – flowering stage
 (iii). Contaf – 0.2 %
 Dis. Res. Var. - IR- 64, Pant Dhan-16, Pant Dhan Sankar - 1

15. INTEGRATED DISEASE MANAGEMENT