杨树溃疡病(Dothiorella gregaria)是彩响杨树造林成活率的主要原因之一,杨树幼苗移栽后水份含量的降低诱发了病菌的为害。移栽前采用适当浓度的有效化学药剂处理幼苗,能促进杨树新根的生长,生根期可提前5～7天;生根量和根长分别较对照增加69.5%和76.73%。幼树吸水能力的增强,减轻了病害的程度,防治效果可达70%左右。 Dothiorella gregaria is one of the main reasons for the success rate of poplar afforestation. The decrease of water content of poplar seedlings after transplanting induces the damage of germs. Before transplanting, the seedlings were treated with appropriate chemical agents in proper concentration to promote the growth of new roots of poplars. The rooting period could be 5 to 7 days ahead of schedule. The rooting and root length increased by 69.5% and 76.73% respectively. Saplings increased water absorption capacity, reducing the degree of disease, control effect of up to 70%.