本世纪初,西马来西亚(指原马来亚——译者注)的胶树就已发生叶炭疽病,但并不严重。近年来,由于用易感病的无性系更新和大面积种植单一无性系,此病越来越流行。目前,叶炭疽病整年都可发生,但以在全年降雨量分布很均匀的柔佛州最严重和持久。曾建议在此病流行时,用铜杀菌剂、代森锌和汞剂喷雾或喷粉加以防治。然而,除苗圃外,在大田喷雾是难以实行的。因此,实际上是任其蔓延。结果,某些地区的胶树、特别是某些无性系,在一年的好几个月中都落掉部分 At the beginning of this century, leafy anthracnose has occurred in the gum tree of West Malaysia, but it is not serious. In recent years, the disease has become more prevalent due to the renewal of susceptible clones and the large-scale cultivation of single clones. Currently, leaf anthracnose can occur throughout the year, but is most severe and lasting in Johor where distribution of rainfall throughout the year is uniform. It has been suggested to use copper fungicides, dexamethasone and amalgam to spray or polish powder for prevention and treatment when the disease is endemic. However, spraying in fields is difficult to achieve except nurseries. So, in fact, let it spread. As a result, gum trees in some areas, especially some clones, fall off in the course of several months of the year