Warning: The information in this archived item was not confirmed with the appropriate National Plant Protection Organization and is provided solely for informational purposes. Please use this information with caution.

Subject: Yellow Dragon on citrus heading towards Australia
Date posted: January 07, 2003
Source: ProMed
An outbreak of Yellow Dragon (YD) or citrus greening disease was reported on the Papua New Guinea (PNG) border (with Indonesia) by the Australian Quarantine and Inspection Service. Neither the pathogen, Liberobacter sp., nor its psyllid vectors, Diaphorina citri and Trioza erytreae, are present in Australia but the report on the PNG border is close enough to encourage Australian authorities to detail the full extent of the outbreak. YD is a caused by a non-culturable bacterium-like organism limited to the vascular system of the plant. The are no controls available post infection. Control of the vector and treatment of potentially infected budwood are crucial in stopping the spread. A disease similar to YD called cucurbit yellow vine disease (CYVD) is raising concern in the United States on Cucurbits (see previous NAPPO story on CYVD posted on 3/5/02).