一、序言近年来,由于木材线虫病的异常蔓延,引起松木类的衰败和枯损,已引起人们的严重关注。但地水母病的危害,直到最近几年,才为林业界所普遍了解。本病的危害性虽不及木材线虫病那样严重,但它往往造成贵重的海岸防护林、风景林、自然休养林和城市近郊林木成群枯死。例如,在日本的富山、石川县一带,此病在一些为防治木材线 I. Preface In recent years, due to the abnormal spread of wood nematode disease, the decline and loss of pine wood have caused great concern. However, the dangers of maternal disease have not been generally understood by the forestry sector until recent years. Though not as serious as wood nematode, this disease often causes expensive coastal shelter forests, scenic forests, natural recreation forests and trees in suburban areas of the city to die out. For example, in Japan’s Toyama, Ishikawa Prefecture, the disease in some for the control of timber lines