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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