巴布亚—新几内亚拥有丰富的甘蔗品种资源,目前世界上的栽培品种中有些就原产于新几内亚。在当地,许多居民的小院内生长有各种甘蔗品种的单株无性系,这些品种资源对甘蔗工业的发展无疑有很大的潜在作用。可是近年来,在巴布亚—新几内亚Ramu河流域一带种植的几种甘蔗品种上发生了一种以前未见过的新病害——Ramu矮化病。感染此病的甘蔗表现植株矮小。通常Ragnar品种的成熟节间长9～ Papua New Guinea has a rich resource of sugarcane varieties, some of which are now native to New Guinea. In the local area, there are many clones of various sugarcane varieties growing in the courtyard of many residents. These varieties of resources have great potential for the development of sugarcane industry. However, in recent years, a new disease not seen before - Ramu dwarfism - has occurred on several varieties of sugar cane planted along the Ramu River valley in Papua New Guinea. Sugarcane infected with the disease showed short plants. Ragnar breeds usually grow internodes 9 to 9 inches long