|1329||Second||Jul 2018||Plant Biosecurity and Product Integrity|
Eumusae leaf spot disease is caused by the fungus Mycosphaerella eumusae and is a serious threat to Australia's banana industry.
The leaf symptoms of eumusae leaf spot disease are very similar to those produced by the banana fungal diseases black Sigatoka (Mycosphaerella fijiensis) (not present in Australia) and yellow Sigatoka (Mycosphaerella musicola) (present in Australia).
Laboratory testing is required to reliably distinguish between these three banana pests.
Eumusae leaft spot (Mycosphaerella eumusae) is a notifiable plant disease in NSW.
All notifiable plant pests and diseases must be reported within 1 working day. You can report notifiable plant pests and diseases by one of the following methods:
A full list of notifiable plant pests and diseases can be found in Schedule 2 of the NSW Biosecurity Act 2015.
Eumusae leaf spot disease damages banana plants by reducing leaf area for photosynthesis.
Reduced leaf area causes uneven bunch ripening and lower bunch weights.
Banana yields can fall by up to 40% due to eumusae leaf spot.
Short distance spread of eumusae leaf spot occurs from the movement of infected soil, water or wind dispersal of fungal spores.
Long distance spread of eumusae leaf spot occurs through the movement of infected banana plant material, including fruit, leaves and young plants.
Eumusae leaf spot disease affects banana leaves at all stages of crop growth.
Eumusae leaf spot disease first appears on the infected banana leaf as small, linear, light brown streaks.
These streaks darken and expand into oval spots with dark brown borders and grey-white centres.
The leaf spots merge to form larger brown necrotic areas with yellow margins (Figure 1).
The grey-white leaf spot centres remain visible on the dead banana leaf tissue.
Eumusae leaf spot disease infects cultivated and wild bananas (Musaceae plant family).
Eumusae leaf spot disease was first found in India in 1992.
Eumusae leaf spot disease has also been found in Malaysia, Mauritius, Nigeria, Réunion, Sri Lanka, Thailand and Vietnam.
Put in place biosecurity best practice actions to prevent entry, establishment and spread of pests and diseases: