Abstract
Little Cherry Disease (LChD), one of the major viral diseases of cherry worldwide, can be caused by two viruses (Little cherry virus 1 and 2), both Closteroviridae members. LChD has an important impact on both yield and fruit quality in commercial sweet and sour cherry (Prunus avium L. and Prunus cerasus L.) (Ruiz-Garcia et al., 2016). LChV-1 (genus Velarivirus) is known to be graft-transmissible and is spread via infected propagated plant material, but no vector has been identified. For LChV-2 (genus Ampelovirus) at least two species of mealybugs (Hemiptera, Pseudococcidae) are known to transmit the virus, namely the apple mealybug (Phenacoccus aceris Signoret) and grape mealybug (Pseudococcus maritimus Ehrhorn). During two growing seasons (2013-15), intensive surveys were conducted in Belgium to monitor the incidence of LChD in sweet and sour cherries and in ornamental Prunus spp., revealing widespread occurrence of both LChV-1 and 2 (De Jonghe et al. 2016). In the close vicinity of a sweet cherry (Prun...
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