Abstract
Abstract A description is provided for Lophodermella orientalis . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Pinus kesiya . DISEASES: 'Yellow band' needle cast of pines. This disease was first encountered at two hardwood forest sites near Darjeeling, at altitudes of 1600 m and 2100 m above sea level, affecting P. kesiya in plantations 6 months, 18 months and 6 years of age. The proportion of trees infected varied from 20-80%, with up to 40% of the needles bearing lesions. Symptoms have been reported mainly from secondary needles and only occasionally from primary needles. They began as broad yellow bands up to 2 cm wide, later each with several large orange or brown elliptical spots which on microscopic examination were seen to be ascomata embedded in the needle. GEOGRAPHICAL DISTRIBUTION: India (West Bengal), Thailand. TRANSMISSION: By ascospores extruded in cirrhi in wet or humid conditions. This is a most unusual feature for members of the Rhytismataceae , which generally disperse by airborne ascospores. It is possible that this species may also disperse by airborne ascospores in conditions other than those in which it has been observed to date.
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