Taxol; micropropagation and in vitro flowering bamboos; phytoplasma diseases of forest and urban trees and shrubs in Canada and east Asia - biology, genome diversity and management; the exploitation and utilization of glycyrrhiza; prospects of recent biotechnological advances in improvement of medicinal plants; biological control of weeds in relation to the maintenance of stable and productive ecosystems; mushroom cultivation and their protection in forests; study of the extraction of natural pigments from edible forest and agricultural crops; some observations on the vegetation damage due to air pollution caused by the 1984 industrial accident in Bhopal; biological control of forest pests in Romania; pine wilt disease-history, biological and biochemical mechanism of rapid wilting and its control; butternut canker - an international concern; ecologically disturbed forests linked to new emerging human diseases.
