导言寄生疫霉(Phytophthora parasitica)和柑桔褐腐疫霉(P.citrophthora)是侵害柑桔根系的两种主要疫霉,它们还能引起果腐、流胶、颈腐和根腐,以及侵染柑桔植株的其他地上部分。土壤和土壤中的病残植物组织是使植物各部分染病的主要病源。对这两种病原体的生物学和病理学目前己了解得很清楚,并己设计出了足够的防 INTRODUCTION Phytophthora parasitica and P. citrophthora are two major Phytophthora infestans that affect the root system of citrus, and they also cause fruit rot, gel, neck and root rot, Other aboveground parts of citrus plants. Sick tissue in soil and soil is the main source of disease in various parts of a plant. The biology and pathology of these two pathogens are now well understood and have been designed to adequately protect