Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Impatiens necrotic spot virus on Hiemalis begonia (Begonia Ă— hiemalis) in Canada.

Abstract

Impatiens necrotic spot virus (INSV) is one of the prevalent viruses infecting ornamental plants, including begonia. The western flower thrips, Frankliniella occidentalis, is the only species currently known to vector INSV. In Spring 2012, stunted plant growth and necrotic spots were observed on leaves of all Hiemalis begonias (Begonia x hiemalis) in a greenhouse in southwest Ontario, Canada. Initial symptoms were mosaic patterns, followed by necrotic spots on leaves, concentric rings, then necrotic areas on flowers, stem and vein necrosis, and finally stunting and burning of foliage similar to damage caused by sunburn or chemical injury. Thrips were observed colonizing nearby begonia plants. DAS-ELISA and reverse transcription-polymerase chain reaction confirmed the causal agent as INSV. This is thought to be the first report of INSV infection in Begonia x hiemalis in Canada.