Bunchy Top of Banana.pptx

Bunchy top of Banana is a most serious disease viral disease.
It is caused by the virus Banana virus-I.
The infected plant produces a cluster of leaves at the apex forming a rosette in the diseased plant.
The disease was first reported on Fiji Island in 1879, later the disease was reported in Australia, Malaysia, Egypt and Sri Lanka.
In India, it is prevalent in Karnataka, Kerala, Andhra Pradesh, Orissa, Bihar, Assam and Tamil Nādu.
In Tamil Nādu, it is very prevalent in Viruppatchia hill station near Dindigul.
This material is useful for School and Undergraduate Students.

1. Presented By J.SAFRINA 18ZOO29 N.SWETHA 18ZOO39 V.VANISRI 18ZOO43 PLANT PATHOLOGY E.M.G. Yadava Women’s College, Madurai-625014 An Autonomous Institution – Affiliated to Madurai Kamaraj University Re-accredited (3 rd Cycle) with Grade A + & CGPA 3.51 by NAAC Dr. V. Vijaya Assistant Professor of Botany E.M.G. Yadava Women's College Thirupplai , Madurai-14. BUNCHY TOP DISEASE OF BANANA

2. Bunchy top Diseases of Banana Bunchy top of Banana is a most serious disease viral disease . It is caused by the virus Banana virus-I . The infected plant produces a cluster of leaves at the apex forming a rosette in the diseased plant. The disease was first reported in Fiji Island during 1879, later the disease was reported in Australia, Malaysia, Egypt and Sri Lanka . In India, it is prevalent in Karnataka, Kerala, Andhra Pradesh, Orissa, Bihar, Assam and Tamil Nādu . In Tamil Nādu, it is very prevalent in Viruppatchia hill station near Dindigul .

3. Symptoms Bunchy top of banana is caused by a virus, namely Bunchy top virus-1 (or) Banana Virus-I or Musa virus-l . The virus is transmitted by the aphid vector called Pentalonia nigronervosa . The disease may occur at any stage of the plant. In the affected plants, leaves become bunched together at the top of the pseudo stem to form a rosette appearance. . The first external symptom is the appearance of irregular , brown streaks along the secondary veins . The midrib portion on the undersurface of the leaf shows chlorotic streaks . Brown streaks are also produced on leaf petiole . The leaf size becomes smaller and narrow .

4. Symptoms In the diseased plant, leaves are clustered at the apex forming a rosette . The infected plant shows stunted growth. Fruits are not usually produced in the diseased plants. The roots show decay.

5. Dissemination In the infected parts virus is present in all the parts including the rhizome and the suckers . The aphid severs the virus in a feeding period of 24 hours and translocate virus to the healthy plant. The aphid (vector) remains viruliferous for about 13 days , after the acquisition of virus. The aphid usually attacks the host plant around the basal portion of the Pseudo stem . The insect may carry the disease to long distances.

6. Control Measures The diseased plants should be thoroughly and carefully dug out with suckers and destroyed by burning. The infected plants along with the aphids should be killed by pouring 50ml of Kerosene over each plant. The virus particles can be killed by injecting the herbicides agrokone (or) 2,4-D (2,4-dichlorophenoxy acetic acid) or MCPA (2-Methyl-1-4 chlorophenoxy acetic acid ) in the diseased plant. Disease free suckers or certified virus free suckers should be used for planting. Strict control on the entry of banana plants from other states and movement of suckers within the state must be checked for infection. The Tamil Nadu Government has banned the cultivation of Viruppatchi banana ( malaivazha i ) in Viruppatchi - a hill station near Dindigul. The Central Government has banned the movement of banana suckers from Kerala, Orissa and West Bengal to other states for the purpose of preventing the spread of bunchy top banana disease.

7. References: https://agritech.tnau.ac.in › banana_diseases › https://www.dpi.nsw.gov.au/biosecurity/plant/insect-pests-and-plant-diseases/bunchy-top

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