Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of lethal yellowing associated with phytoplasma subgroup 16SrIV-A on silver date palm and Chinese windmill palm in Louisiana.

Abstract

During the 2017 autumn season, silver date palms (Phoenix sylvestris) and Chinese windmill palms (Trachycarpus fortunei) planted in a residential landscape in Baton Rouge, Louisiana, USA, exhibited typical phytoplasma-related symptoms. All 3 silver date palms showed necrosis of fronds in the lower one-third of the canopy, whereas all 3 Chinese windmill palms had dead spear leaves with lower fronds drooping and either chlorotic or necrotic. The causal pathogen was isolated and identified as Phytoplasma subgroup 16SrIV-A based on various molecular analyses. The sequences obtained from silver date palm and Chinese windmill palm were deposited in GenBank (accessions MG243700 and MG243701). This is thought to be the first report of lethal yellowing in palms caused by Phytoplasma subgroup 16SrIV-A outside of Florida, within the USA.