This rapid assessment shows: Trialeurodes abutiloneus is a highly polyphagous whitefly pest widely found in North America, Central America, South America and the Caribbean. It is known to be present in glasshouses in north-eastern states in the USA, as well as field crops in southern states. It has not been recorded outside the Americas, but it has been intercepted on North American plants arriving in the UK. This whitefly is a known vector of 8 plant pathogenic viruses (all 8 absent from the UK, and 5 of these also absent from Europe), but a key area of uncertainty in this assessment is the impact of this species due to its vectoring capacity.