摘要
通过对小黑杨苗木、幼林的田间试验,控制发病强度,摸清了苗木不同病情造成的生长量损失及幼林病情与损失之间的关系,确立了插条苗、留床苗的防治指标;建立了幼林经济允许损失率的动态模型及相应的防治指标动态模型。同时文中给出了松嫩平原西部速生丰产林的防治指标。
The damaged sapling and young tree growth by grey-spot disease were thrashed out by controlling the different disease intensity in the field test. The control indexes of saplings from cuttings and saplings from roots were determined, and the dynamic models for economic injury damage rate as well as control index were established for young trees. At same time,the paper has also given the control index of fast-growing and high-yield plantation in the west part of Songnen plains.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1991年第3期13-20,共8页
Journal of Northeast Forestry University
关键词
杨树
灰斑病
防治指标
Poplar
Grey leaf—spot
Control
Index
