Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of the Citrus tristeza virus trifoliate resistance-breaking (RB) genotype in 'Newhall' sweet orange in South America.

Abstract

In 2015, nine Citrus tristeza virus (CTV) subisolates were obtained by single aphid (Toxoptera citricida) transmission (SAT) from a field isolate named SNH-A, which was collected from a 23-year-old asymptomatic Newhall sweet orange grafted onto Poncirus trifoliata in a commercial orchard at Paysandú, Uruguay, in January 2014. CTV was detected in one of these subisolates (SNH-9-sA) by 3DF1+3CA5 and MCA13 antibodies 30 days after SAT and identified as a CTV trifoliate resistance-breaking (RB) genotype based on various molecular analyses. This is thought to be the first report of the presence of the CTV RB genotype in South America.