Puccinia is a genus of fungi that includes approximately 5000 species, some of which are devastating pathogens of wheat and other cereals. Puccinia graminis causes stem rust in wheat, P. recondita causes brown leaf rust, and P. striformis causes yellow stripe rust. These rusts have polymorphic life cycles with multiple spore stages. Symptoms vary by species but generally include blisters or pustules that erupt and release spores, which can be brick red in stem rust and cause stems and leaves to blacken. Brown leaf rust first appears on upper leaves while yellow stripe rust primarily affects leaves. In barberry shrubs, rust symptoms appear as yellow to orange spots on leaves.

1. PUCCINIA
PRESENTED BY:
 DIBYA THAPA MAGAR (17)
 DINESH GHIMIRE (18)
 GAJENDRA BHATTA (19)

2.  SYSTEMATIC POSITION:
 Kingdom: Mycota
Division: Eumycota
Subdivision: Basidiomycotina
Class: Teliomycetes
Order: Uredinales
Family: Pucciniaceae
Genus: Puccinia
 Species : graminis

3. INTRODUCTION:
 The genus includes about 5000 species.
 Some species are autoecious(single host) whereas some are
heteroecious.
 Mainly 3 species are found to be devastating wheat and
other cereals field through rust:
 Puccinia graminis – Stem rust in wheat
 P. recondita –Brown leaf rust
 P. striformis - Yellow stripe rust
 Rust are polymorphic, it means several forms of spores
exist in its life cycle. (Fig. 1)

4. Fig.1. Various stages of Puccinia

5. SYMPTOMS:
 Black stem rust:
 Appear as elliptical blisters/pustules called uredia(Fig.2)
 Infected parts burst out exposing mass of brick-red colored
urediospores.(Fig.3)
 Later on, the blisters turn black as fungus produces
teliospores.
 Uredia are transformed into black telia.

6. FIG.2. STEM RUST

7. FIG.3. T.S. of affected leaf of wheat showing uredospores

8.  Brown leaf rust:
 First seen on upper
leaves.
 Yellow stripe rust:
 Appear mainly on
leaves than leaf sheath
and stem.
 In Barberry, the
symptoms appear as
yellowish to orange
colored spots on
leaves.(Fig.4.)

9. Fig.4. Leaf rust in barberries sps.

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