WELCOME……
Bacterial and viral diseases of
Wheat
Nagendra,S.R.
ALB2100
Contents
Bacterial Diseases
 Yellow Ear Rot
 Black
chaff/Bacterial
streak
 Bacterial leaf
blight
Viral DiseaseS
Wheat ...
1)Yellow Ear Rot /
Tundu Disease
Pathogen: Clavibacter tritici (the disease is
known to occur only in association with
ne...
The disease is characterized by twisting, distortion
of earhead and
 rotting of spikelet's, with profuse oozing of yello...
2)Black chaff = bacterial streak
• Pathogen: Xanthomonas translucence pv.
undulosum
•Favorable Environmental
Conditions:
B...
Symptoms:
 Discoloration of
glumes on a
mature white
head
Dark purple
discoloration of
wheat stem
BACTERIAL LEAF BLIGHT
• Pathogen: Pseudomonas syringae pv. syringae
• Favourable conditions : Moist and mild
weather durin...
Symptoms:
 Start as narrow chlorate lesions on leaves, turn yellow
and then dark brown
When moist, a water soaked appear...
VIRAL DISEASES:
Wheat Soil borne Mosaic Virus
Wheat Streak Mosaic Virus
1)Wheat soil borne mosaic virus
• Pathogen: Wheat yellow mosaic virus
(WYMV)
• Conditions: Long periods of fluctuating
tem...
Polymyxa graminis,is the reported vector of
wheat soil borne mosaic virus is an obligate root
parasite of wheat.
Symptoms:
Yellow green
mosaic on young
leaves, stunting,
severe rosetting
and excessive
tillering.
This virus is
transmi...
2)Wheat streak Mosaic Virus
Transmission: Eriophes tulipae(Wheat
curl mite)
Alternate hosts: Maize, oats, barley, wild g...
Mosaic streaking
all along the veins,
the infested plants
produce fewer or
less tillering and
stunted growth.
Symptoms:
• Infects both winter and
spring wheat.
• Earlier infection =
greater yield loss.
• Grassy weeds, volunteer
wheat, corn, e...
diseases of wheat
of 17

diseases of wheat

Published on: Mar 3, 2016
Published in: Science      
Source: www.slideshare.net


Transcripts - diseases of wheat

  • 1. WELCOME……
  • 2. Bacterial and viral diseases of Wheat Nagendra,S.R. ALB2100
  • 3. Contents Bacterial Diseases  Yellow Ear Rot  Black chaff/Bacterial streak  Bacterial leaf blight Viral DiseaseS Wheat Soil borne Mosaic virus  Wheat streak Mosaic Virus
  • 4. 1)Yellow Ear Rot / Tundu Disease Pathogen: Clavibacter tritici (the disease is known to occur only in association with nematode ( Anguina tritici )  The bacterium is spherical , gram positive and capsulated.  SPREAD: Seeds contaminated with nematode galls are responsible for the spread of the disease.
  • 5. The disease is characterized by twisting, distortion of earhead and  rotting of spikelet's, with profuse oozing of yellow liquid from the infected tissues. Symptoms
  • 6. 2)Black chaff = bacterial streak • Pathogen: Xanthomonas translucence pv. undulosum •Favorable Environmental Conditions: Black chaff is favored by wet and humid weather.
  • 7. Symptoms:  Discoloration of glumes on a mature white head Dark purple discoloration of wheat stem
  • 8. BACTERIAL LEAF BLIGHT • Pathogen: Pseudomonas syringae pv. syringae • Favourable conditions : Moist and mild weather during flag leaf emergence. • It can tolerate warm or freezing temperature. • Free moisture is required for disease development.
  • 9. Symptoms:  Start as narrow chlorate lesions on leaves, turn yellow and then dark brown When moist, a water soaked appearance from the bacterial exudate I.e. sticky yellowish colors.
  • 10. VIRAL DISEASES: Wheat Soil borne Mosaic Virus Wheat Streak Mosaic Virus
  • 11. 1)Wheat soil borne mosaic virus • Pathogen: Wheat yellow mosaic virus (WYMV) • Conditions: Long periods of fluctuating temperatures in early spring. • Transmission: Soilborne fungal vector (Polymyxa graminis) and sap transmission
  • 12. Polymyxa graminis,is the reported vector of wheat soil borne mosaic virus is an obligate root parasite of wheat.
  • 13. Symptoms: Yellow green mosaic on young leaves, stunting, severe rosetting and excessive tillering. This virus is transmitted by soil borne fungi.
  • 14. 2)Wheat streak Mosaic Virus Transmission: Eriophes tulipae(Wheat curl mite) Alternate hosts: Maize, oats, barley, wild grass
  • 15. Mosaic streaking all along the veins, the infested plants produce fewer or less tillering and stunted growth. Symptoms:
  • 16. • Infects both winter and spring wheat. • Earlier infection = greater yield loss. • Grassy weeds, volunteer wheat, corn, etc. can harbor both WSMV and the mite vector.

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