diseases of wheat
Published on: Mar 3, 2016
Transcripts - diseases of wheat
Bacterial and viral diseases of
Yellow Ear Rot
Wheat Soil borne
1)Yellow Ear Rot /
Pathogen: Clavibacter tritici (the disease is
known to occur only in association with
nematode ( Anguina tritici )
The bacterium is spherical , gram positive and
SPREAD: Seeds contaminated with nematode
galls are responsible for the spread of the
The disease is characterized by twisting, distortion
of earhead and
rotting of spikelet's, with profuse oozing of yellow
liquid from the infected tissues.
2)Black chaff = bacterial streak
• Pathogen: Xanthomonas translucence pv.
Black chaff is favored by wet and humid
glumes on a
BACTERIAL LEAF BLIGHT
• Pathogen: Pseudomonas syringae pv. syringae
• Favourable conditions : Moist and mild
weather during flag leaf emergence.
• It can tolerate warm or freezing
• Free moisture is required for disease
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.
Wheat Soil borne Mosaic Virus
Wheat Streak Mosaic Virus
1)Wheat soil borne mosaic virus
• Pathogen: Wheat yellow mosaic virus
• Conditions: Long periods of fluctuating
temperatures in early spring.
• Transmission: Soilborne fungal vector
(Polymyxa graminis) and sap
Polymyxa graminis,is the reported vector of
wheat soil borne mosaic virus is an obligate root
parasite of wheat.
mosaic on young
This virus is
transmitted by soil
2)Wheat streak Mosaic Virus
Transmission: Eriophes tulipae(Wheat
Alternate hosts: Maize, oats, barley, wild grass
all along the veins,
the infested plants
produce fewer or
less tillering and
• Infects both winter and
• Earlier infection =
greater yield loss.
• Grassy weeds, volunteer
wheat, corn, etc. can
harbor both WSMV and
the mite vector.