This lecture include symptoms, causal organism, disease cycle and management of black rust of wheat

1. Stem / Black Rust of Wheat
DR. RAJBIR SINGH
Associate 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
Note: All the used images in this lecture have been taken from net. I am grateful to all authors of
images.

2. Stem / Black Rust of Wheat
• World wide
• Epidemic in the world & India
• March – April in north India
• Nov. – Dec. in South India
• Below - 3000 feet
• Loss – 90%

3. Symptoms :
• Affect all parts except roots
• Brown color pustules
• Bursting of epidermis by urediospore
• Later stage – teliospore formation
• Due to teliospore / urediospore black appearance- called
black rust
Effect on pls.
• Early ripening

5. • No grain formation or small in size
• Low quality flour
• Pl. – small in size
• Less tillering
• Loss of shining of seed & pls.
• Low quality straw not eaten by animals
• ↓ photosynthesis
• ↑Transpiration & respiration

7. Pathogen – Puccinia graminis f. sp. tritici
• Spores – 1. Pycniospore - Pycnidial stage - O
2. Aceospore – Aecial stage – I
3. Urediospore – Uredial stage – II
4. Teliospore - Telial stage – III
5. Basidiospore – Basidial stage - IV

8. Systemic Position
Kingdom – Mycota/ Fungi
Division – Eumycota
Sub division – Basidiomycotina
Class – Teliomycetes
Order – Uredinales
Family – Puccinaiaceae
Genus – Puccinia
Species - graminis f. sp. tritici

9. Disease Cycle
• Hetrocious - different host – Berberis,
Mohinia
• Macro cyclic – all 5 stages
• Fav. Conditions-
• Tem 17-18 º C for rapid spread
• 15.5-21º C for Urediospre germination

11. URIDIOSPORES

12. Teliospres

13. TELIOSPORES

14. PYCNIOSPR
ES

15. BASIDIOSPORES

16. AECIOSPORES IN ACEIUM

17. AECIDIOSPORES IN AWCIDIAL CUP
PYCNIDIUM

18. Yellow leaves of barberry

19. Disease Management
• Early sowing
• Mixed cropping
• Balance fertilizer –↓ N ↑ K
• Proper irrigation
• Dithane M- 45@ 2-3 kg/ha or Tilt @ 0.1% or Plantavax@.02%
IInd spray 10 days after Ist spray & IIIrd spray at 14 days
• Dis. Res. Var.- HW- 741, WH- 614, Kundan, RR-21, HD-
2428, UP- 215

20. Thank You