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3. UNIVERSITY OF ALLAHABAD
2019-20
ASSIGNMENT ON
DETAILED STUDY OF FUNGAL DISEASES OF WHEAT
SUBMITTED TO SUBMITTED
BY
PROF. H.K.KHERI PREM PRAKASH
(PROFESSOR) M.Sc. (Ag.) Botany 1st
Sem.

4. FUNGAL DISEASES OF WHEAT

5. FUNGAL DISEASES OF WHEAT
Major Fungal disease in wheat……….
i. RUSTS
a) Stem rust
b) Leaf rust
c) Stripe rust
ii. LOOSE SMUT
iii. KARNAL BUNT
iv. POWDERY MILDEW
v. FOOT ROT
vi. LEAF BLIGHT

6. RUSTS
– Three forms rusts canaffect wheat (allfungal
forms)

7. RUSTS
– Three forms rusts canaffect wheat (allfungal
forms)
a) Stem rust (Black rust )
b) Leaf rust (brown rust)
c) Stripe rust (yellow rust)

8. • BLACK OR STEM RUST
Pathogen :-
Puccinia graminis tritici
Uredospores arebrown and
oval
Eachcell of teleutospore has
one pore
Sizeis about 25-30x15-
20µm

9. •SYMPTOMS :-
 Reddish brown pustules
 Thelarge number of
uredosori burst, release
their spores
 Infected parts burstingto
expose amassof brown
uredospores
 Brownish appearanceeven
from adistance

10. •SYMPTOMS :-
 Reddish brown pustules
 Thelarge number of
uredosori burst, release
their spores
 Infected parts burstingto
expose amassof brown
uredospores
 Brownish appearanceeven
from adistance

11. Favorableconditions
oTemperature: Between 23-25° C
oIn this condition largenumberof teliospores are
produced.
Alternate hosts
Berberis,
 Mahonia and
 Mahoberberis

12. LEAF RUST (BROWN RUST)
Pathogen: Puccinia recondita
The pathogen is macrocyclic
rust.
Uredospores are brown and
spherical
16-28um in diameter

13. •SYMPTOMS :-
Theblack telial pustules
are usually formed onthe
dorsal side of leaves
Thepustules burst early
with mild displacementof
the hostepidermis
And deeply embeddedinto
the host.

14. •SYMPTOMS :-
Theblack telial pustules
are usually formed onthe
dorsal side of leaves
Thepustules burst early
with mild displacementof
the hostepidermis
And deeply embeddedinto
the host.

15. Stripe Rust(yellow rust)
Caused by: Puccinia striiformis
Uredospores are spherical to
ovate in shape
Uredospores are orange
colored.
Size measuring from 23-35x20-
35µm
Teleutospores are dark brown
and flattened at the top when in
contact with the epidermis

16. SYMPTOMS :-
appear early in the
spring.
Rust pustules are
yellow.
 Spores are blown in
from warmer areas.
 Disease development
is most rapid under
cool, wet weather.

17. SYMPTOMS :-
appear early in the
spring.
Rust pustules are
yellow.
 Spores are blown in
from warmer areas.
 Disease development
is most rapid under
cool, wet weather.

18. ALTERNATE HOSTS
• Agropyron,
• Bromus etc.

19. ALTERNATE HOSTS
• Agropyron,
• Bromus etc.
Favorable conditions
 Temperature: 10-15 °C

20. DIFFERENCEBETWEEN (STRIPE RUSTANDLEAF
RUST)

21. LoosesmutofWheat
Pathogen:
Ustilago segetu var. tritici
The teliospores are single
celled and formed irregularly
from fertile hyphae.
Teliospores are olivaceous
brown, spherical to oval
 Measures 5-9µm in diameter

22. SYMPTOMS:
Canonly be seenat the time
of flowering though the plants
are infected right after seed
germination.
Earsof infected oneemerge
early than healthyone.
 and transformed into black
powdery mass
Whole ear is coveredby
delicate silverymembrane.
 Resulting in formation ofvery
dark olive brown powderymass

23. • Kernelbunt
• Pathogen: Neovassia indica
 Sporesare smooth walled
 Measuring 22-49µmin
diameter
 Requireslong rusting period
 Theprimary sporadia are
needle shaped andflexible
 Thesecondary sporadia are
sickle shaped

24. • SYMPTOMS:
Plants ripen early thanthe
healthy one
Earsare dark green
Theglues are pushed apart
by the spore balls which
are formed instead of
kernels

25. • POWDERYMILDEW
• Pathogen: Erysiphegraminis
var.tritici
• Theconidia are elliptical,
hyaline, single celled,thin
walled and produced in
chains
• Fungus produce septate,
superficial, hyaline mycelium
on leaf surface with short
conidiophores

26. • SYMPTOMS:
 Greyish white powdery
growth appears on leaf,
sheath, stem and floral
parts
 Powdery growth later
become black lesion and
 Drying of leavesand
 Other parts

27.  Fungusremains infected in plant debris asdormant
mycelium
 Favorable temperature is 20-21°C and High RH

28. • FOOTROT
Pathogen: Pythium
graminicolum andP.
arrhenomanes
This fungus produces
sporangia, zoosporesand
oospores.

29. • SYMPTOMS:
 Thediseasemainly occurs
in seedlings
 Roots and rootlets become
brown in color
 Seedlings becomes pale
green and have stunted
growth
Wet weather andhigh
rainfall isfavorable