List of major groups of plant viruses and some important groups explained.

3. 1. Luteovirus group
2. Maize chlorotic dwarf group
3. Sovemoviruses group
4. Tombusviruses group
5. Tobacco necrosis viruses group
6. Tymovirus group
7. Comovirus group
8. Dianthovirus group

4. 9.Nepovirus especially grou
10.Alfalfa mosaic virus group
11.Bromo virus group.
12.Cucumovirus group
13.Ilarviruses group
14.Velvet Tobacco mottle virus group
15.Tobraviruses group
16.Hordeiviruses group

5. 17.Polerovirus group
18. Carlavirus group
19.Potyviruses group
20.Closteroviruses group
21.Crypto virus group
22.Retrovirus group
23.Satellite virus group
24.Rhabdovirus group

6. 25.Tomato spotted wilt virus
26. Reovirus group
27.Gemini virus group
28.Caulimovirus group
29.Tenuivirus group
30.Nanoviruses group.

7.  The name of this group was derived from Latin
world luteus meaning yellow.
 Produces yellowing symptoms on plants.
 Symptoms on plant disappears and plant
appears recover.
 Particles are isometric not enveloped 24-27 nm in
size.
 Genome contains monopartite ssRNA within
isometric particles.

8.  Surface is smooth
 Thermal inactivation point is 45-75 °C
 Longitivity in vitro is 5-21 days.
 Other members of the group Beet mild yellows, Beet
western yellows. Carrot red leaf, Legume yellows,
Malva yellows, Pea leaf roll, Soybean dwarf. Tentative
members are Beet yellow net. Celery yellows,
Groundnut rosette assistor, Chickpea stunt, Grapevine
ajinoshika leaf yellows, Milk vetch dwarf, Physalis
mild chlorosis, Physalis vein blotch, Raspberry leaf
curl, Ryegrass clilorotic streak, Tobacco vein distorting,
Tobacco yellow net, Tobacco yellow vein assister.
Tomato yellow net and Turnip latent virus .

9.  This group have very vast host rang and
infect plant of different families.
 Pea leaf roll, Soybean dwarf and Turnip
yellows cause loss of millions all across the
world.
 In India groundnut rosette cases minimum
30% yield loss annually.

11.  Name is derived from Cucumber mosaic virus
 Viruses in this group have tripartite genome
encapsulated in three types of isometric particles.
 Measuring about 28 nm in diameter.
 Transmitted by aphids
 Non vector transmission by mechanical
transmission, grafting and seed

12.  Thermal inactivation point is 66°C
 Longitivity in vitro is 8-10 days
 Positive sense SsRNA virus
 Member species are Cucumber mosaic virus,
Peanut stunt virus, Tomato aspermy virus,
Cowpea ring spot virus.
 Cucumber mosaic virus is one of the major
disease of Cucumber in India.
 This disease cause heavy loss in fruit quality
and quantity in open or in protected
conditions.

14.  Name derived from Tobacco mosaic virus
 Viruses have rigid rod shaped particles
 Genome have positive sense single stranded
RNA
 Viruse is readily mechanically transmissible
 It rang from 18x300 nm in size
 Member species are Tobacco mosaic virus,
tomato mosaic virus.

15.  This is a devastating disease for Tobacco
growing regions.
 This disease is found everywhere in the
world where Tobacco is grown.
 Reduces quality of the leaves which interns
reduces the yield.
 Courses 50-80 yield loss.

17.  Name derived from Tobacco rattle VIRUS.
 Virion contains single stranded positive RNA.
 The group have viruses with rigid rod shaped
particle RNA with two different lengths 180
nm and 46-114 nm in size.
 Transmitted by Nematode vector
trichodoridae.
 Thermal inactivation point 74-85°C.

18.  Longitivity in vitro is 25-183 days.
 Member species are Tobacco rattle Viruse, Pea
early browning, Pepper ring spot virus.
 Tobacco rattle Viruse is second most
destructive viral disease after TMV,
 In UP alone the disease yield loss of 30-50%
every year.
 Pea early browning and pepper ring spot
reduces the fruit quality and causes loss to
farmers.

20.  Name of the group taken from Greek rhabdos
meaning rod.
 Bacilli form or bullet shaped.
 160-380 nm in size.
 Negative sense single stranded RNA virus.
 Transmitted in nature by members of aphididae
and cicadellidae in persistent manner.
 Thermal inactivation point 40-75°C

21.  Longitivity in vitro is 4 days.
 Dilution end point is from 10 raise to -2 to 10
raise to - 5.
Other members of the group are Barley yellow
strait mosaic, Beet leaf curl, Broccoli necrotic
dwarf, Lucerne enation . Maize mosaic, Northern
cereal mosaic, Potato yellow dwarf. Raspberry
vein chlorosis, Rice transitory yellowing . Saw
thistle yellow vein, Strawberry crinkle, Wheat
(American ) straite mosaic und Wheat chlorotic
streak virus. Tentative members of the group are
Chodrilla juncea stunting, Red clover mosaic.

22.  This group causes major losses in beet,
Broccoli, Maize, etc.
 In wheat and Barley virus causes up to 50-70
yield loss.
 In potato growing states of North India this
disease is a major threat.

24.  Isometric particles measuring 85nm in diameter.
 They are enclosed within lipoprotein envelope.
 It has negative sense single stranded RNA.
 In nature Transmitted by thrips.
 Thermal inactivation point 45°C.
 Longitivity in vitro is less than 5 hours in room
temperature.

25.  Members species are Peanut bud necrosis
viruse, Peanut yellow spot virus, Peanut
yellow mottle virus, tomato spotted wilt
virus.
 This virus has reported to cause plant
diseases all over the world.
 Courses considerable yield loss in tomato
and ground nut crop.
 Other members of solanoceae family are also
effect by this virus.

27.  Besides plants some viruses are known to cause
diseases in vertebrate and invertebrates.
 It is double stranded RNA virus.
 This group is again divide in two groups
phytovirus and Fijivirus.
 Virion particle measures 70 nm.
 In nature Transmitted by leaf hoppers in
propagative manner.

28.  Other members species are sugarcane
Fijivirus, Maize rough dwarf, Oat sterile
dwarf, rice black streak dwarf, pangola stunt,
cereal tillering disease virus, rice ragged
stunt virus.
 Many members of graminae are affected by
this virus.
 Yield loss upto 70% has been reported.

30.  Name derived from Greek meaning twins.
 Has unusual morphology as particles occur in
pairs.
 It is single stranded circular DNA virus.
 Measuring 18-20 nm in size.
 Transmitted by leaf hoppers in non
propagative manner.

31.  Member species bean golden mosaic, tomato
yellow leaf curl, cotton leaf curl virus, Tobacco
leaf curl virus, tomato golden mosaic virus.
 This group causes considerable loss in tropical
region.
 Fiber crop are severely affected by this group.
 quality and quantity of fiber is reduced.
 In tomato the deformed fruits are produced
which fetches less price in market.

33.  Name derived from Cauliflower mosaic virus.
 This group have double stranded DNA with
three discontinuities two in on strand and one
in other.
 Virion measures about 50 nm in diameter.
 In nature Transmitted by members of
aphididae in semi persistent manner.

34.  Thermal inactivation point is 75-80°C,
Longitivity in vitro is 1-32 days.
 Member species are Carnation etched ring,
dahlia mosaic, mirabilis mosaic, and
strawberry vein banding virus.
 In strawberries the virus causes major loss of
yield and quality all over the world.
 In flowering crops quality of flowers is
greatly effected this causes loss to the
farmers.