PAT 401

1. COLLEGE OF AGRICULTURAL TECHNOLOGY
(Affiliated to Tamil Nadu Agricultural University, Coimbatore-3)
Kullapuram (Po),ViaVaigai Dam, Theni-625 562
VIRAL DISEASES OF BANANA
Course teacher: Name:
Dr.Parthasarathy.S, Chanchal Gireesh S
Asst.,Professor,(Plant Pathology) 2015021023

2. Viral diseases of banana
Banana bract mosaic virus
Banana infectious chlorosis
• Banana streak virus

3. Bract Mosaic Virus
•Banana bract mosic virus (BBrMV,) - locally known as kokkan.
•Symptom develops in primarily transmitted through infected
suckers

4. Transmission
Primary infection: Infected Sucker
Secondary infection: mealy bugs

5. Symptoms
• Yellow streaks on leaves. Splitting of the pseudo stem.
• Abnormal emergence of the bunch from the middle of the pseudo stem.
• Produce fewer fruits of smaller size.
• Dark reddish-brown mosaic symptoms, which are especially obvious in
bracts.
Spindle-shaped chlorotic streaks running parallel to the veins.
 Distinctive dark colored mosaic patterns, stripes or spindle-shaped streaks
are visible.

6. Streaks on bracts

7. Pinkish streaks on pseudostem

8. Management Practices
 Transmission by mealy bugs.
 Requires early detection, and immediate eradication of infected
plants.
 Effective control of the disease, similar to that of other viral diseases.
 virus-free propagating materials should be planted

9. Banana Streak Virus
• Banana streak virus (BSV) is an important disease of Musa
and affecting the productivity of both bananas and plantains.
• Reported in nearly all countries where this crop is grown
including Mauritius, India and many countries of the African
continent.

10. Symptoms
• The most characteristic foliar symptoms of infection are chlorotic streaks,
which become necrotic with time.
• The leaf lamina may also be narrower, thicker and become torn.
•Stunting of the plant, constriction of the bunch on emergence
(choking), altered phyllotaxis (leaves arranged in a single vertical
plane instead of the normal spiral pattern), and detachment and
splitting of the outer leaf sheaths of the pseudo stem.

11. Symptom

12. Management Practices
 The eradication of infected plants.
 The use of BSV-free planting materials.
 BSV can be carried in in-vitro plantlets, as it is not
eliminated by shoot-tip culture.
 Virus particles can only be detected in areas of leaf
tissue with symptoms.
 Parts of leaves with pronounced symptoms should
be used for serological indexing.

13. Infection chlorosis mossiac disease:Erwinia
carotovora sub sp. carovora
 Infectious chlorosis one of the most common diseases in banana.
 The diseases causes yellowish green patches and thickening of veins
 Leaf sheaths also pull away from the pseudostem easily. Since the
disease is caused by virus, chemical control is of no use

14. Symptom
• The disease is characterized by the presence of
typical mosaic-like or discontinuous linear
streaking in bands extending from margin to
midrib.
• Rolling of leaf margins, twisting and bunching of
leaves at the crown and a rigid erectness in newly
emerged leaves
• The presence of dead or drying suckers is noticed
in advanced cases referred as heart rot resulting
from rotting of heart leaf and central portion of
pseudostem

15. • Primarily infected banana plants develop severe
mosaic symptoms in young growth showing
broadly streaked chlorotic or yellowish green
bands and patches or chlorotic mottling
distributed in patches over the leaf lamina
• The leaves are narrower and smaller than normal
and the infected plants are dwarf and lag behind
in growth. Such plants do not produce bunches
but as a virus reservoir

16. Symptoms
Linear streaking Bunching of leaves
Rotting of heart leaf

17. Pathogen and vector
Cucumber mossaic virus Aphis gossypii

18. MANAGEMENT
Cultural method
• The banana gardens should be kept free from weeds.Infected
suckers should not be used for planting.Weeds in the nearby areas
should be removed as the virus survives in them in off-season.
• Growing pumpkin, cucumber and other cucurbits between the rows
of banana crop should be avoided
• Early detection by regular inspection of planting and eradication of
diseased plants from the field as soon as they are noticed.
• Use of high input crop management system comprising of 10 kg
farm yard manure at the time of planting and subsequently at an
interval of 3 months. 1 kg neem cake, 200 gm nitrogen, 40 gm
phosphorus, 200 gm potassium per plant, 4 weeding at 2 months
interval up to 8 months stage.

19. Chemical method
• Spraying Methyl Demeton 0.03 per cent (0.3 ml/lit of water) at
3 to 4 weeks interval controls the vector and reduces the
spread of the disease.
• Foliar spray of micronutrient (0.2% CuSo4(2ml/lit), 0.2%
FeSo4(2ml/lit), 0.5% ZnSo4(5 ml/lit) and 0.1% H3Bo3(1
ml/lit of water) at 3,5 and 7th month after planting and
spraying Glyphosate 2Kg per hectare to control weeds.Control
of insect vector by spraying Phosphomidon at 1 ml per litre or
methyl demeton at 2 ml per litre

20. References
• T.S Thind “Diseases of fruit and vegetables and their
management”. Kalyani publishers (page no:52-60).
• Bose S.K and Gupta B.P “Importance pest and
diseases of temperate fruits.