Defra's tree health and biosecurity task force started work on the register in response to ash dieback hitting the UK in 2012. The list consists of more than 100 tree pests and diseases that could threaten the UK.
HTA policy manager Gary Scroby said: "The Food & Environment Research Agency (FERA) has asked for comments from the trade by mid November and I am coordinating those from HTA committees now."
Meanwhile, FERA is heading an international Palm Protect project to tackle red palm weevil and the moth Paysandisia archon. FERA is also leading the International Plant Sentinel Network launched at the Global Botanic Gardens Congress in New Zealand last week.