木瓜更新的难题在夏威夷,木瓜多栽种在该岛东南角的火山岩石地上。用实生苗栽种的木爪,生长3—4年后,由于产量下降而且植株长高难于管理而需要更新。但是,第二次重新栽种建立新木瓜园常遭失败,这是因为幼苗成活率低造成的。在更新园里,尚存活的幼苗生势很差,常感染严重的根腐病,是由棕榈疫霉 Papaya renewal problem In Hawaii, papaya is planted in volcanic rock in the southeast corner of the island. Growing 3-4 years after growing with live seedlings requires renewal due to reduced yields and difficult plant management. However, the second replanting to establish a new papaya plant often failed due to low seedling survival rates. In the renewal garden, surviving seedlings are poorly tolerant, often infected with severe root rot,