4. Rust is a disease the appears in Cereals
Crops i.e. Wheat
It is caused by a fungus knows as
Puccinia spp (3,000-4,000) Species
Puccinia is an obligate parasite
Required two alternate host
It has macrocyclic life cycle
Common name of “Rust” in other languages
Are rati,gerua,tombora etc.
5. According to G.C Ainsworth (1971)
Kingdom Fungi
Division Eumycota
Sub-Division Basidiomycotina
Class teliomycetes
Order Uredinales
Family Puccinaceae
Genus Puccinica
Species P graminis tritici
6. There are three form of Rust Affect the wheat
as follows
Stem rust
Puccinia graminis tritici (black Rust)
Leaf rust
Puccinia rodentia (Brown Rust)
Stripe rust
Puccinia striiformis (yellow Rust)
7.
8. 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%!.
9.
10. Fungus
Puccini graminis f. sp. tritici
Common names:
1. stem rust
2. black rust
Infects:
1. wheat
2. barley
3. Barberry
12. 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
It is called black rust.
The site of infection is visible symptom of
disease.
13.
14. It has two host as follows
Primary Host (Triticum aestivum)
It Produces i.e urediospores & teliospores
Basidiospores
Secondary host (Berberis Vulgaris)
it produces i.e aeciospores & pycnidospores
15. Fungus gains entrance to host through stomata.
Up to five spore Spore stages of Puccinia graminis
Stage 0:
Spermogonium. Produces spermatia and receptive
hyphae.
Stage I:
Aeciums produce aeciospores.
Stage II:
Uredium produce urediospores.
Stage III:
Telium produce teliospores.
Stage IV:
Basidium produceages.