Leaves bunching at top of plant
Leaves bunching at top of plant
Green leaves dropping
Green leaves dropping
Panama disease (Fusarium wilt)
Biosecurity Alert
Cause: The fungus Fusarium oxysporum f. sp. cubense which is a soil-borne organism. It is spread in water, soil and planting material. It enters the plant through the roots, and blocks the conducting tissue within the plant resulting in wilting, yellowing of leaves, splitting of pseudostem and death of the plant.
Solution: There is no cure for affected plants. Use only approved planting material and do not plant in previously infested areas.
Biosecurity obligation: Panama is a notifiable disease and you must report any suspicious plants. If you suspect Panama disease you must notify Biosecurity Queensland immediately (13 25 23).
More info:
Bacterial corm rot
Cause: The bacteria Pectobacterium spp (formerly known as Erwinia spp.) are widespread in most soils. Plants that are stressed from heat or lack of water during the dry season can succumb to bacterial invasion during the early part of the wet season.
Solution: No chemical treatments are available. Ensure adequate moisture levels are maintained during the dry season and provide good drainage during prolonged wet seasons.
Water stress
Cause: Mild water stress during periods of high evaporation.
Solution: Apply more water during periods of high demand.
Internal stem discolouration
Internal stem discolouration
Panama disease (Fusarium wilt)
Biosecurity Alert
Cause: The fungus Fusarium oxysporum f. sp. cubense which is a soil-borne organism. It is spread in water, soil and planting material. It enters the plant through the roots, and blocks the conducting tissue within the plant resulting in wilting, yellowing of leaves, splitting of the pseudostem and death of the plant.
Solution: There is no cure for affected plants. Use only approved planting material and do not plant in previously infested areas.
Biosecurity obligation: Panama is a notifiable disease and you must report any suspicious plants. If you suspect Panama disease you must notify Biosecurity Queensland immediately (13 25 23).
More info:
Moko disease
Biosecurity Alert
Cause: The bacteria Ralstonia solancearum race 2. Moko is a soil-borne disease and is spread with soil, in water, on implements, in planting material and by insects from flower to flower. The infection enters the plant through the roots and spreads through the host, blocking conducting tissue and resulting in plant yellowing, wilting and death.
Solution: There is no chemical control for Moko. All plants plus an adequate buffer zone around the diseased plants must be destroyed. The area must be quarantined and only non-host plants grown.
Biosecurity obligation: If you suspect Moko disease you must notify Biosecurity Queensland immediately (13 25 23).
More info:
Stem shatters
Stem shatters
Panama disease (Fusarium wilt)
Biosecurity Alert
Cause: The fungus Fusarium oxysporum f. sp. cubense which is a soil-borne organism. It is spread in water, soil and planting material. It enters the plant through the roots, and blocks the conducting tissue within the plant resulting in wilting, yellowing of leaves and death of the plant.
Solution: There is no cure for affected plants. Use only approved planting material and do not plant in previously infested areas.
Biosecurity obligation: Panama is a notifiable disease and you must report any suspicious plants. If you suspect Panama disease you must notify Biosecurity Queensland immediately (13 25 23).
More info:
2,4-D damage
Cause: Injection of 2,4-D will kill the plant. Overspray or drift from herbicide application may cause lesser symptoms.
Solution: Be extremely careful with chemical applications.
Tissue-cultured off-type
Cause: A genetic abnormality that occurs in tissue-cultured plants.
Solution: Remove affected plants and set additional following suckers on nearby plants.
Banana streak virus
Cause: The banana streak virus (BSV). Symptom expression is sporadic. Symptoms of cucumber mosaic are similar.
Solution: Do not take planting material from infected plants. Eradicate infected plants where symptoms are observed. Confirm diagnosis by looking for yellow black streaks or flashes on leaves or by laboratory tests.
Frost
Cause: Frost during the growing season.
Solution: No cure for damaged plants. Slightly damaged plants may grow out of it.
Small and stunted plants
Small and stunted plants
Tissue-cultured off-type
Cause: A genetic abnormality occurring in tissue-cultured plants.
Solution: Remove affected plants and set additional following suckers on nearby plants.
Burrowing nematode
Cause: Severe root damage caused by burrowing nematode affects the plant’s ability to take up water and nutrients from the soil.
Solution: Check a random sample of roots from the whole field to determine if nematodes are the problem and if a nematicide treatment is necessary.
Banana weevil borer
Cause: Tunnelling by larvae of Cosmopolites sordidus in the corm. Sever infestation reduces plant vigour.
Solution: Use stem baits (traps) to establish the severity of the infestation. If numbers exceed an average of 4 weevils per trap, treat with appropriate insecticide. Pheromone traps are also available.
Banana bunchy top
Biosecurity Alert!
Cause: The banana bunchy top virus (BBTV) which is spread on 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.
Reporting: 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 Information:
Not enough water/dry conditions
Cause: Insufficient water for plant growth.
Solution: Use water scheduling techniques to supply sufficient water to meet the plant’s requirements.
Plants turn yellow and die
Plants turn yellow and die
Bacterial corm rot
Cause: The bacteria Pectobacterium spp. (formerly known as Erwinia spp.) that are common soil inhabitants. Plants that are stressed during the dry season can succumb to invasion during the wet season.
Solution: No chemical treatments are available. Ensure adequate moisture levels are maintained during the dry season and provide good drainage during prolonged wet seasons.
Water-logging
Cause: Not enough oxygen for the roots caused by too much water in the soil from rainfall or irrigation.
Solution: Avoid planting in areas that are often water-logged and in heavy soils. Install and maintain the drainage system for your plantation.
Panama disease (Fusarium wilt)
Biosecurity Alert
Cause: The fungus Fusarium oxysporum f. sp. cubense which is a soil—borne organism. It is spread in water, soil and planting material. The fungus enters the plant through the roots and blocks the conducting tissue within the plant, resulting in wilting, yellowing of leaves, splitting of pseudostem and death of the plant. There are several “races” of the disease which affect different varieties.
Solution: There is no cure for affected plants. Use only approved planting material and do not plant in previously infested areas.
Biosecurity obligation: Panama is a notifiable disease and you must report any suspicious plants. If you suspect Panama disease you must notify Biosecurity Queensland immediately (13 25 23).
More info:
Herbicide damage (glyphosate)
Cause: Glyphosate spray drift onto green parts of the plant. The first symptom is yellowing of leaves.
Solution: No cure for damaged plants. Be extremely careful when using glyphosate.
Plants kink, bend or fall over
Plants kink, bend or fall over
Borrowing nematode (plants fall over)
Cause: Burrowing nematode feeding on roots weakens the plant’s root system.
Solution: Check roots over the whole field to determine if nematodes are the problem and if a nematicide treatment is necessary. Propping or tying string between plants may prevent some losses.
Banana weevil borer (plants fall over)
Cause: Tunnelling by larvae of Cosmopolites sordidus in the corm. Sever infestation reduces plant vigour.
Solution: Use stem baits (traps) to establish the severity of the infestation. If numbers exceed an average of four weevils per trap, treat with appropriate insecticide. Pheromone traps are also available.
More info:
Banana weevil borer – general information
Poor tying (plants bend or kink)
Cause: Incorrect bunch and tree support.
Solution: Ensure tying or propping is done correctly.
Heat stress/lack of water (plants bend or kink)
Cause: Extreme heat and or dry conditions.
Solution: Use water scheduling techniques to supply sufficient water to meet the plants’ requirements.
Fruit rotting after harvest
Fruit rotting after harvest
Anthracnose
Cause: The fungus Colletotrichum musae. Spores are produced on dead banana material and are spread to young fruit in water droplets. The fungus remains dormant in the tissue until the onset of ripening.
Solution: Handle harvested banana fruit with care to avoid damage. Apply appropriate post-harvest fungicide treatment.
Crown rot
Cause: Several organisms can be responsible for causing crown rot symptoms. These include Musicillium theobromae, Fusarium equiseti-incarnatum (species complex), Colletotrichum musae and Thielaviopsis musarum. Symptoms can vary from fungal growth ‘fluff’ present on the cut crown surface through to complete breakdown of fruit.
Solution: Application of appropriate post-harvest fungicides will assist in minimising symptoms in the supply chain.
More info:
Crown end rot research
Fruit rotting in field
Fruit rotting in field
Sunburn
Cause: Insufficient bunch shading during prolonged high temperatures.
Solution: There is no cure for affected fruit. Maintain good canopy cover and ensure bunch covers are applied properly. It may be necessary to pull a leaf down over the bunch for protection.
Cigar end
Cause: The fungus Musicillium theobromae (formerly known as Verticillium theobromae). It enters the fruit from the dead floral parts and extends 10 to 20 mm into the fruit.
Solution: Cigar end is a minor disease and specific control measures are not warranted.
Mixed ripe
Cause: Various stresses (severe leaf spot, pest damage, water and nutrition) reduce the rate of fruit filling.
Solution: Improve crop management to limit stresses on the plant.
Punctures or splits on fruit
Punctures or splits on fruit
Birds or bats
Cause: Birds and bats landing on the bunch to feed on nectar from immature flowers.
Solution: Cover bunches promptly and use thick covers. For Lady Finger apply covers before any bracts lift on the bunch.
Bell injection
Cause: Incorrect bell injection technique.
Solution: Train staff to inject slightly above one-third from the top of the bell.
