First report of Emphasis Type="Italic"Oidium citri/Emphasis in Bhutan

摘要

Powdery mildew is one of the most important diseases of citrus in Bhutan where it infects new flush growth causing leaf and shoot distortion and twig and branch dieback. It also attacks young fruitlets. This causes premature fruit drop. These symptoms, together with DNA sequence data and the production of single conidia and lobed appressoria, suggest that the disease is caused by Oidium citri (JM Yen) U. Braun. This is the first formal report of this pathogen in Bhutan.