stem rust of wheat

wheat

1. NAME:HUZAIFA ISMAIL SEC-A ROLL# 006 4th Semester PLANT PATHALOGY

2. Rust Diseases of Wheat

3. Types of Rust: Three forms can affect wheat (all fungal forms) Stem rust Leaf rust Stripe rust

4. Stem Rust: Most destructive wheat disease Severe grain shriveling Masses of pustules on leaves & stems containing brick red spores Rust infested plants transpire much more water than normal. Most important disease of wheat, globally! Drastically reduces growth and yield, up to 70 %!. Brittle stems can fall over or “lodge” hampering mechanical harvest .

5. Wheat Stem Rust: Fungus, Puccini graminis f. sp. tritici Common names: stem rust black rust Infects: wheat barley barberry

6. Favourable Condition and Host Temprature 23-25 C At this temperature large number of teliospores are produced Host : Berberis Mahonia

7. Symptoms: Reddish brown pustules. Large number of uredo spores are released Brownish appearance even from distance. Towards end black telia are produced for this reason it is called black rust. The site of infection is visible symptom of disease.

8. Stem rust :

9. Life cycle : Up to five spore Spore stages of Puccinia graminis : Stage 0: Spermogonium . Produces spermatia and receptive hyphae. Stage I: Aeciums produce aeciospores. S tage II: Uredium produce urediospores . Stage III: Telium produce teliospores . Stage IV: Basidium produceages .

10. Disease cycle : Urediospores and teliospores occur on Wheat. Fungus gains entrance to host through stomata.

11. Urediospores Early spring, aeciospore infects Wheat to start infection ..

12. Spore stage gives plant its characteristic rusty color. Uredio spore stage is “repeater stage”. Continually re infects wheat into late summer.

13. Late summer, uredium converts to telium and produce telio spores. Telio spore are thick-walled, with two cells and black.

14. Teliospore over winters. Following spring, germinates to produce basidia and basidiospores . Basidiospores Convert into sporangium. Then sporangium converts into aceiospores and the cycle continues.

15. Management: Variety choice. Fungicides. Cultural practices. Earlier wheat maturing varieties.

16. The end Thanks for listening