Citrus tristeza closterovirus is present in the United Arab Emirates
So far, the United Arab Emirates were considered free from citrus tristeza closterovirus (EPPO A2 quarantine pest). In 1995-1996, during a preliminary survey the disease was observed. It apparently has a limited extent. Some of the infected trees, scattered in different areas of the Emirates, had been imported from various countries. All infected trees have been destroyed. This is the first report of citrus tristeza closterovirus in the United Arab Emirates.
In addition, it is noted that lime witches’ broom phytoplasma (EU Annex II/A1) is now widespread in the United Arab Emirates where it has a rapid and devastating effect on both species of sweet lime (C. limetta and C. limettioides) and citron (C. medica) and a slower crippling effect on acid lime (C. aurantiifolia). A high percentage of all these species has been destroyed by the disease. It is noted that no information is available on transmission of the disease (insect vector, graft or seed transmission?). The incidence of the disease increases with poor soils and high salinity of irrigation water.
Sources
Al Shuraiki, R.K. (1997) Disease and pest outbreaks – United Arab Emirates. Citrus tristeza in the United Arab Emirates.
Arab and Near East Plant Protection Newsletter (FAO), no. 25, p 27.