Banana bunchy top virus

Banana bunchy top virus (BBTV), belonging to the Babuvirus genus, is the most serious viral disease affecting banana and abaca plants worldwide. Once a plant is infected, it ceases to produce fruit, making this virus a major threat to agricultural productivity in tropical regions.

The pathogen is a single-stranded DNA virus that exclusively infects members of the Musaceae family. It spreads systemically throughout the plant, primarily localizing in the phloem tissue, which disrupts the transport of nutrients and causes severe developmental stunting.

Diagnostic symptoms include the appearance of small, narrow, and upright leaves that bunch together at the top of the pseudostem, creating the characteristic "bunchy top" appearance. On the underside of the leaves, dark green streaks are often visible along the veins, which is a key identifying marker.

The virus is exclusively transmitted by the banana aphid (Pentalonia nigronervosa). The insect acts as a persistent vector, acquiring the virus by feeding on infected phloem and transmitting it to healthy plants. Aphid migration is the primary driver of disease outbreaks across neighboring fields.

Management relies on strict phytosanitary measures, as there is no chemical cure for infected plants. The strategy involves the complete removal and destruction of symptomatic plants and their underground corms, combined with rigorous vector control to reduce the population of banana aphids on the plantation.

• Strict quarantine on planting material
• Removal and destruction of infected plants
• Vector (aphid) population monitoring
• Use of certified virus-free seedlings