Streaks on leaves
Banana bunchy top
Cause: The banana bunchy top virus (BBTV) which is spread in infected planting material and by the banana aphid, Pentalonia nigronervosa. BBTV is not present in tropical Australia, and movement of planting material is controlled by legislation.
Solution: There is no cure for this disease and all infected plants must be eradicated.
Biosecurity: Under state legislation, banana bunchy top disease must be reported. If you have seen plants with banana bunchy top symptoms within the Southern Queensland banana biosecurity zone, or the NSW Banana Bunchy Top Virus Control Zone contact the Banana Bunchy Top Hotline on 1800 068 371.
If you have seen banana bunchy top outside of these areas, you must report it within 24 hours to the Biosecurity authority in your state (Biosecurity Queensland on 13 25 23, or NSW DPI Biosecurity Hotline 1800 680 244) or the Exotic Plant Pest Hotline on 1800 084 881.
More info:
Better Bananas
Australian Banana Growers Council
Queensland Department of Primary Industries
Plant Health Australia
New South Wales Department of Primary Industries and Regional Development
Banana streak virus
Cause: The banana streak virus (BSV). The pale streaks or flecks on the leaves become darker with age. Symptoms of cucumber mosaic virus are similar.
Solution: Eradicate infected plants and set additional following suckers on neighbouring plants. Do not take planting material from infected plants.
Chlorotic patching
Cause: A physiological disorder that indicates the plant is suffering stress. It usually occurs in spring and can be related to water-logging.
Solution: Determine the exact cause of plant stress. Check for corm or root damage from banana weevil borer or nematodes.
Cucumber mosaic virus
Cause: Cucumber mosaic virus (CMV). This virus has a wide host range and can be spread to bananas by aphids.
Solution: Disease incidence is sporadic and generally low. Control measures are not warranted. Do not take planting material from infected plants.
October to November streak
Cause: A physiological disorder of unknown cause which generally occurs during October and November.
Solution: There is no known cure. Plants will grow out of it.
Variegation
Cause: A genetic abnormality that occurs in tissue-cultured plants.
Solution: Destroy affected plants and set additional following suckers on neighbouring plants.
Zinc deficiency
