Tomato yellow leaf curl virus, potato spindle tuber viroid
Tomato yellow leaf curl virus / silverleaf whitefly
The exotic virus known as tomato yellow leaf curl virus (TYLCV), a begomovirus, was detected in early 2006 in south east and south west regions of Brisbane on cherry tomatoes and in Bundaberg in both commercial and home garden tomatoes. This was the first record of this disease occurring in Australia.
The whitefly Bemisia tabaci biotype B (silverleaf whitefly) is the main vector, transmitting TYLCV in a persistent manner. Silverleaf whitefly (SLW) is known to occur in Queensland, New South Wales, Northern Territory and Western Australia, but has not been found in Victoria since an isolated detection in 2003. SLW has a wide host range, enabling it to rapidly spread TYLCV.
TYLCV causes the most devastating virus disease complex of tomato in tropical and warm temperate regions, with crop losses of up to 100 per cent.
SLW and TYLCV are declared exotic pests in Victoria. An order restricting or prohibiting the entry or importation of TYLCV host material into Victoria was introduced in August 2006.
Potato spindle tuber viroid (PSTVd)
This disease was confirmed in mid December 2006 in field tomatoes in Carnarvon, Western Australia. The viroid, which is a declared exotic disease in Victoria, can have serious impact on both tomato and potato industries.
Field symptom guide
All the following symptoms are from tomatoes.
Tomato yellow leaf curl virus
Potato spindle tuber viroid
Photo: Department of Agriculture and Food, Western Australia
To report suspected exotic or unusual pests or diseases, call the EXOTIC PLANT PEST HOTLINE 1800 084 881.