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.

The mangrove plantations mainly with Sonneratia apetala and Avicennia officinalis along the coastal belt and offshore islands of Bangladesh encounter a number of problems. Of these, gcomorphological changes, species succession and insect infestation arc threatening to the continuity of the established plantations under the traditional management practices. New management strategy has to be developed for the that underplanting with suitable species in the existing plantations may be a solution to the problem. Commercially important species like Excoecaria agallocha, Ileritiera fomes and Xylocarpus mekongensis appear promising for their inclusion in the proposed large scale underplanting programmme.