Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Exobasidium vexans. [Descriptions of Fungi and Bacteria].

Abstract

A description is provided for Exobasidium vexans. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Camellia sinensis. DISEASE: Blister blight of tea; by far the most serious disease of tea and apparently confined to this host. GEOGRAPHICAL DISTRIBUTION: Endemic throughout the tea growing areas of Asia- Bangladesh, Cambodia, China, India, Indonesia, Japan, Malaysia (W.), Nepal, Sri Lanka, Taiwan, Thailand and Vietnam but not at present recorded from Africa, CMI Distribution Map 45. TRANSMISSION: By basidiospore discharge from mature blisters and wind-borne; only the younger leaves are susceptible to infection. Basidiospore discharge occurs during humid conditions for 7-10 days, spores being released in vast numbers. In Sri Lanka most air borne basidiospores were trapped during the S.W. & N.E. monsoons (May-June and November).