Banana Bunchy Top Virus Control

Symptoms

Caused by Banana bunchy top virus spread by the banana aphid. Leaves become narrow, short, upright and crowded at the top giving a bunchy rosette look. Dark green dots and streaks, like Morse code, appear along the leaf veins and midrib. Infected plants are severely stunted and rarely produce a usable bunch.

Damage

Bunchy top is one of the most damaging virus diseases of banana. Plants infected early are stunted and yield nothing, while those infected later give small malformed bunches. The virus passes through infected suckers and is spread plant to plant by aphids, so it can wipe out plantations if not checked.

Organic & cultural control

Use only certified virus free tissue culture plants. Inspect fields regularly and immediately uproot and destroy any plant showing bunchy top symptoms along with its suckers and corm so it cannot spread. Control the banana aphid that carries the virus by spraying neem oil and conserving natural enemies, and remove banana weeds and ratoons that harbour the virus.

Chemical control

There is no chemical that cures a virus infected plant, so the only real action is removing diseased plants and controlling the aphid vector. A recommended insecticide may be applied to suppress aphids before uprooting infected clumps to stop them flying to healthy plants. Always read and follow the label, observe the pre-harvest interval, and consult your KVK or agronomist.

Always follow the product label, the recommended pre-harvest interval, and your local KVK or agronomist. Pesticide approvals change, so verify before use.

Prevention

Plant only virus free certified or tissue culture material and never take suckers from fields with bunchy top. Carry out regular surveys and rogue out infected plants early, before aphids multiply. Maintain a buffer free of volunteer banana, and manage aphids on planting material at the nursery stage.