Ganoderma is a fungal pathogen that causes diseases on a variety of perennial crops including oil, palm, tea, rubber and coconut. Basal stem rot of oil palm caused by Ganoderma is considered the single major disease constraint to oil palm production in South East Asia, where losses can reach 80% after repeated planting cycles. Chapters in the book are based on presentations given at regional research workshops, one held in Egham, UK in August 1998, the other in Serdang, Malaysia in October 1998.