Teak (Tectona grandis) is indigenous to India, Burma, Thailand, Indonesia and many other islands in the Far East (Bakshi 1976). The species has been widely planted in this country. A large number of teak seedlings are being raised every year. From the Forest Range Nurseries of Khaskhali, Bakkhali, Chunati and Idgah, death of 3 months’ old seedlings were reported to the Bangladesh Forest Research Institute. In the nurseries of Bakkhali and Khaskhali, the percentage of mortality of teak seedlings was about 35 and 80 respectively. Khaskhali was the worst affected of all the reported nurseries. In Napithkhali, wilting killed 50% of the seedlings raised in 18 beds. The lower leaves died first and then the upper ones followed. Information of this disease also came from Ultachari in 1985, Taktanala in 1986 and Farua in 1988.

During 1981-83, 12 to 16 years old jack fruit (Artocarpus heterophyllus L.) trees grown in Chittagong University campus were severely affected with brown leaf spots. Nigrospora sphaerica (Sacc.) Mason and Pestalotiopsis Versicolor (Sperg.) Steyaert were found to be associated with the disease (Herb. IMI No. 266275) and the pathogens are a new record for the plant. As these fungi have not been reported on jack fruit tree in Bangladesh, a study was made to determine their pathogenicity with jack fruit plant. The disease samples were collected and the symptoms of the disease were recorded carefully. The most characteristic symptoms of the disease appeared in the months of December, January and February. At first brown yellow coloured spots of 0.5-10mm. appeared on infected leaf and then the spots gradually coalesced and became larger to attain a size upto 11.0 cm.