摘要
在东北地区青杨叶锈病严重发生地区，对小里杨１．２．３年生苗木，分别按病情等级对苗木的生长量、损失率进行测定，确定了经济阈值和防治指标：插条苗经济阈值的病情指数为１４，防治指标的病情指数１５～１６时为重点防治，大于１８时应全面防治；平茬苗经济阈值的病情指数为２１，防治指标的病情指数２２～２３时为重点防治，大于２３时应全面防治；养干苗经济阈值的病情指数为２４，防治指标的病情指数２５～２６时为重点防治。
The growth and loss rate of 1-,2- and 3-year-old Populus simonii×P.Nigra that suffered from poplar rust disease were measured according to the disease intensity in Fuyu nursery, Heilongjiang.The disease index of economical injury threshold forcuttings, stump seedlings and sapling was determined as 14, 21 and 24 respectively. Selected key control should be made when disease index is in 15-18 (cuttings) or 22-23(stump seedlings) or 25-26(saplings) and overall control must be conducted when the disease index is above that value.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1997年第3期18-21,共4页
Journal of Northeast Forestry University
关键词
青杨
叶锈病
经济阈值
防治指标
Poplar
Leaf rust disease
Economical injury threshold
Control index
