This study concerns factors affecting production and survival
of ascospores of Elytroderma deformans (Weir) Darker, a needle
cast of ponderosa pine (Pinus ponderosa Laws.).
The results show that summer cooling and a reduction in host
vigor delays and diminishes the number of fertile hysterothecia
produced. Evidence is offered for classification...
This study concerns the effect of pre-harvest killing of commercial
sized, forty year old western hemlock (Tsuga heterophylla
(Raf.) Sarg.) on subsequent stump infection by Fomes annosus (Fr.)
Karst. Further evaluations were made on tree drying, loosening of
bark, wood deterioration and rate of crown and cambial death. Findings
on...