Nursery Diseases of Dipterocarpus retusus

Dipterocarpus retusus is widely used in the manufacturing of plywood in North-eastern region of the country. The species suffers heavily from a variety of diseases caused mainly by fungal pathogens in the nursery. During the period of 1995 to 2000, various diseases such as damping-opp, ischolar_main rot, shoot blight and foliar diseases were recorded at different nurseries. The causal organisms, disease symptoms, incidence periods and the extent of damage were studied in detail. These are described here for the first time. Prophylactic management of these nursery diseases is warranted.