This document discusses the yellow rust disease of wheat, caused by the fungus Puccinia striiformis. It covers the classification of the pathogen, the economic significance of yield losses up to 100%, the disease cycle involving uredospores and teliospores, distribution in India and worldwide, symptoms of yellow stripes and pustules on leaves and stems, favorable cool and wet conditions for disease development, and management through resistant varieties, crop rotation, and fungicide application.

1. Student :
AKASHDEEP
SUTRADHAR
Dept. of Plant
Pathology
Teacher:
Dr. ADESH KUMAR
HOD, Dept. Of Plant
Pathology

2. CONTENT
 Classification.
 Economic significance.
 Etiology.
 Distribution.
 Symptoms.
 Favourable conditions.
 Diseases cycle.
 Management.

3.  Disease Name: Yellow rust
of wheat.
 Other names: Stripe rust/
Early rust/ Linear rust/
Systemic rust.
 Pathogen name: Puccinia
striiformis.

4. CLASSIFICATION
 Kingdom: Fungi
 Phylum: Basidiomycota
 Class: Urediniomycetes
 Subclass: Incertaesedis
 Order: Uredinales
 Family: Pucciniastraceae
 Genus: Puccinia
 Species: striiformis

5. ECONOMIC SIGNIFICANCE
 Losses can be 50%, but in severe situations
100% is vulnerable.
 In countries where wheat is grown in winters
or at high elevations, yellow rust is a
common threat, but not more significant than
wheat leaf rust and stem rust, which are
continuous threats in all wheat-growing
countries.

6. ETIOLOGY
 It is considered to be an obligate parasite.
 It is macrocyclic.
 Haterocious in nature.
 The fungus produces bright yellow to orange uredospores 30
to 35 μm in diameter . These spores have thick and
echinulated walls and are contained in pustules on the plant .
 Uredospore production usually is followed by teliospore
production late in the growing season.
 Teliospores are mainly stalked bicelled, dark brown, with
falttened apex.
 No alternate host is known. The pathogen survives in wheat
as dormant mycelium in cooler climates.

7. DISTRIBUTION
 In India,
Hills, plains of Punjab, Haryana, western UP and southern
hills zone also found in the Nilgiri hills of Tamil Nadu.
 In World,
European countries and Australia are mostly effected by
the diseases.

8. SYMPTOMS
 The first sign of stripe rust is the
appearance of yellow streaks (pre-
pustules), followed by small, bright
yellow, elongated uredial pustules
arranged in conspicuous rows on the
leaves, leaf sheaths, glumes.
 Mature pustules will break open and
release yellow-orange masses of
uredospores.
 The infected tissues may become brown
and dry as the plant matures or becomes
stressed.
 Severe early infection can result in plant
stunting.

9. FAVOURABLE CONDITIONS
 Puccinia striiformis. var. tritici. can survive as
dormant mycelium on wheat.
 Stripe rust is most common in higher elevations
and cooler climates. The pathogen is best
sustained when night time temperatures are
<15°C.
 Optimum uredospore germination occurs at 7-
15°C.
 Heavy dew or intermittent rains can speedup
the spread of the disease.

10. UREDOSPORE TELIOSPORES
PUSTULES

11. DISEASES CYCLE

13. MANAGEMENT
 Mixed cropping and crop rotation.
 Avoid excess Nitrogenous fertilizers.
 Growing Resistant varieties like Lerma Rojo,
Safed Lerma, Sonalika and Chotil.
 Sulphur dusting @ 35-40 kg/ha.
 Spray Mancozeb @ 2g/lit.