4 research outputs found
The Tympanis Canker of Red Pine
A new disease of red pine has recently been found in southern Connecticut, Rhode Island, eastern Massachusetts, western and central New York, northern New Jersey, eastern Pennsylvania, central Ohio, and southern Michigan. It is of serious consequence only on plantation-grown red pine, but it also occurs occasionally on eastern white pine. On the former host it is characterized by axially elongated, annual main-stem cankers which are always centered at the nodes. Infection takes place through adhering lateral dead branches and the growth of the fungus after it gains entrance to the stem.is usually very rapid-Le., cankers up to three feet in length may be formed in one year\u27s time. Infection of red pine has been found only where the tree has been planted south of its optimum range
Recommended from our members
The significance of the discolorations in aircraft lumber : noble fir and western hemlock
A survey was made in Oregon and Washington of the discoloration occurring in noble fir and Western hemlock wood, and the present data are presented as an aid in the inspection of these woods for aircraft and other high-grade lumber.
Recommendations, based on strength tests of similar discolorations in spruce or on tests made by the Forest Products Laboratory, for the acceptance or rejection of the various discolorations occurring in noble fir and Western hemlock follow
Recommended from our members
The significance of the discolorations in aircraft lumber : Sitka spruce
A survey was made of the discolorations occurring in Sitka spruce wood, and toughness tests were made on specimens that included discolorations of unknown or doubtful significance
Recommended from our members
The significance of the discolorations in aircraft veneers : American beech
American beech (Fagus grandiflora) is now, and probably will be, increasingly used to replace yellow birch for aircraft construction. Even though it is one of the principal components of the northern hardwood forests of North America, study of the characteristics and properties of its wood has been neglected to the extent that relatively little is known of the normal color variation and correspondingly less of the common discolorations