Western Australia Biosecurity Alert: Restrictions on Importing Euphorbia from VictoriaUpdated 2 months ago

The Reason for Restriction: Tomato Yellow Leaf Curl Virus (TYLCV)

Western Australia (WA) maintains strict quarantine laws to protect its vulnerable environment and valuable agricultural industries. The import restriction on plants of the Euphorbia genus (which includes ornamentals like poinsettias and various spurges) from eastern states like Victoria is directly related to its classification as a potential host for a severe plant disease complex that threatens the tomato industry.

• TYLCV Host Plant: Certain species of Euphorbia can harbour the Tomato Yellow Leaf Curl Virus (Begomovirus coheni or TYLCV). While the plant itself may not always show severe symptoms, it acts as a reservoir for the disease.

• Vector Relationship: TYLCV is spread by a tiny insect called the Silverleaf Whitefly (Bemisia tabaci). This whitefly feeds on many Euphorbia species and can carry the virus from an infected host plant to a healthy tomato plant, facilitating the spread of this damaging disease.

• WA's Status: WA's biosecurity priority is to prevent the entry and establishment of TYLCV, a 'Declared Pest' which can cause devastating crop losses (up to 100%) in tomatoes and also affects capsicums and beans.

The movement of Euphorbia plants from an area known to have TYLCV (like parts of Victoria and Queensland) poses an unacceptable risk to WA's biosecurity, even if the individual plant appears healthy