摘要
通过人工接种发病试验和长期自然发病观测，证明主干上病斑数量、感病指数和材积损失率三者成正相关，可作为杨树水泡型溃疡病防治的三项指标：主干上有病斑２５个以下，感病指数１０以下和材积损失率１０％以下时，是溃疡病受害允许水平，不需采取防治措施，可保持自然平衡；主干上有病斑２６～５０个，感病指数１０～２０，材积损失率１０％～２０％，应加强经营管理，提高植株抗病能力；主干上有病斑５１～７５个，病情指数２０～３０，材积损失率３０％左右，应重点进行药剂防治；主干上有病斑７６～１００个以上，病情指数４０～５０以上，材积损失率５０％以上，应采取综合全面防治措施，或伐掉重新造林。
Through experiment and Long term observation under natural condition on the pathogen′s numbers,loss of volume and disease index,the control index of Dothiorella gregaria canker of poplar was determined.The artificial inoculation and reinoculation results showed that the number of disease spots on stem,disease index and loss of volume were positively related to each other. For the 3～4 years old poplar when its DBH is over 3～4 cm,the spots of disease is under 25 on stem,the disease index is 10,loss of volume is under 10%,which is the economic threshold for the saplings. When the spots on stem reach 50～75,the disease index is 20～30,loss of volume is 30%,managerial measures have to be adopted in some serious area. The spots on stem reach over 76～100,the disease index is 40～50,loss of volume is over 50%,large scale control must be carried out.
出处
《林业科学研究》
CSCD
北大核心
1996年第4期409-412,共4页
Forest Research
关键词
北京杨
水泡型溃疡病
防治
杨树
Populus beijingensis, Dothiorella gregaria, control index
