. Bulletin (Pennsylvania Department of Forests and Waters), no. 38-39. Forests and forestry. 26 TilK AlLANTHUS TrEE IN PENNSYLVANIA oO years. It progresses rapidly and is also a big factor in reducing shortly thereafter the stands begin to open up, for ailanthus is a very intolerant tree. When the tree crowns reach full-size they begin to break down, for the branches are very brittle. Strong Avinds and snow pressure are responsible for many deformed crowns. The effect of incomplete and broken crowns shows up immediately in a slowing down of volume growth. Heart rot sets in soon after the tree
. Bulletin (Pennsylvania Department of Forests and Waters), no. 38-39. Forests and forestry. 26 TilK AlLANTHUS TrEE IN PENNSYLVANIA oO years. It progresses rapidly and is also a big factor in reducing shortly thereafter the stands begin to open up, for ailanthus is a very intolerant tree. When the tree crowns reach full-size they begin to break down, for the branches are very brittle. Strong Avinds and snow pressure are responsible for many deformed crowns. The effect of incomplete and broken crowns shows up immediately in a slowing down of volume growth. Heart rot sets in soon after the tree reaches 30 years. It progresses rapidly and is also a big factor in reducing volume growth. To get the best yield, ailanthus of sprout origin should not be handled in rotation of more than 30 years, and trees of seed- ling origin are at their best before 50 years. THE WOOD OF AILANTHUS In general appearance, the wood of ailanthus is similar to ash and chestnut. It is moderately heavy, rather durable, medium in hardness, i^omewhat difficult to split, and of a beautiful satin-like lustre. Oven- dried ailanthus wood weighs pounds cubic Cutting Up a Big Ailanthus Tree for Fuel Wood. The sapwood is wide and white to yellowish. The heartwood is grayish orange. The annual growth rings are wide and distinct. The spring- wood is very broad with numerous large vessels toward its inner margin and few small ones scattered or grouped toward the outer part. The medullary rays are distinctly visible to the nailed eye and have a satiny lustre. The pith is large and brownish. Ailanthus wood does not .shrink nor warp much in seasoning, has a beautiful grain, and takes a fine polish. A panel veneered with ailanthus was exhibited at the St. Louis Fair. It attracted considerable attention, and, upon request, was sent to Europe. Ailanthus wood is used for fuel, occasionally in cabinet work, and in a few instances in the manufacture of musical w' \ The Ailanthus Tree in Pennsylvania 27 in
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