Asian American Pacific Islander Month DDSD 2024.pptx
REDGRAM STERILITY MOSAIC VIRUS
1. PAT– 302 DISEASES OF FIELD CROPS AND
THEIR MANAGEMENT (1+1)
ASSIGNMENT TOPIC
REDGRAM STERILITY MOSAIC VIRUS
SUBMITTED BY, COURSE TEACHER,
M.HARISHMADEVI, Dr.PARTHASAARATHY.S,
2015021047. Asst. Prof., (PLANT PATHOLOGY).
2. HISTORY
Pigeonpea sterility mosaic virus (PPSMV), a species of the
genus Emaravirus, is the causal agent of sterility mosaic
disease (SMD) of pigeonpea [Cajanus cajan ].
This disease, dubbed the 'green plague', as the infected plants
remain in the vegetative state without flower production, has
been reported from India and a few other South-East Asian
countries.
SMD is estimated to result in an annual yield loss of over
US$300 million in India alone.
3. EMARAVIRUS
Emaravirus is a genus of plant viruses. The genus has
Five species:
European mountain ash ringspot-associated virus
(type species), Fig mosaic virus, Pigeonpea sterility
mosaic virus, Raspberry leaf blotch virus, and Rose
rosette virus.
4. SYMPTOMS
The Symptoms are characterized by bushy and pale
green appearance of plants. The excessive Vegetative
growth, stunting, prominent mosaic on leaves and
reduction in leaf size.
Complete or partial cessation of flowering leads
to sterility.
5. Excessive vegetative growth and fail to produce
flowers (sterility).
The leaves are small and show a light and dark green
mosaic pattern initially appear on young leaves.
Only some parts of the plant may show disease
symptoms, and other parts remain normal.
6. Depending on genotype three types of Symptoms are
recognized.
a. Severe mosaic and sterility
b. Mild mosaic and partial sterility
c. Chlorotic ringspot without any noticeable sterility.
11. SYSTEMATIC POSITION
Group : Group V ((−)ssRNA)
Order : Bunyavirales
Family : Fimoviridae
Genus : Emaravirus
Species : Redgram sterility mosaic virus
12. MODE OF SPREAD
Through vector – Aceria cajani (eriophyid mite)
Aceria cajani in a semi persistant manner, mites
retaining the virus 12-13 hours, eggs of mites do not
transmit.
The self grown redgram plants and perennial species act
as source of virus inoculums.
13. PATHOGEN
It is caused by Pigeonpea sterility mosaic virus(PPSMV).
The virions are slender highly flexuous filamentous
virus like particles (VLPS) of 3-10nm diameter, a major
virus specific proteins of 32kDa and 5-7major RNA
species of 0.8-6.8kb.
15. FAVOURABLE CONDITIONS
Caused by Pigeonpea sterility mosaic virus (PPSMV)
A single Eriophyid mite vector(Aceria cajani) is
sufficient to transmit the disease.
Perennial, ratooned and volunteer pigeonpea provide
mite vector and the pathogen.
16. Shade and humidity encourage mite
multiplications.
Disease incidence is high when Pigeon peas are
inter-mixed cropped with sorghum or millets.
18. INTEGRATED DISEASE MANAGEMENT
(IDM)
Rogue out infected plants up to 40 days after sowing.
Spray
Monocrotophos at 500 ml /ha soon after appearance
of the disease and if necessary, repeat after 15 days .
![HISTORY
Pigeonpea sterility mosaic virus (PPSMV), a species of the
genus Emaravirus, is the causal agent of sterility mosaic
disease (SMD) of pigeonpea [Cajanus cajan ].
This disease, dubbed the 'green plague', as the infected plants
remain in the vegetative state without flower production, has
been reported from India and a few other South-East Asian
countries.
SMD is estimated to result in an annual yield loss of over
US$300 million in India alone.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)