Effects of competition from young northern hardwoods on red pine seedling growth, nutrient use efficiency, and leaf morphology

The effects of competition from three northern hardwood tree species on red pine (Pinus resinosa Ait.) seedlings were examined on two clear-cut sites in western Maine. We examined how planted red pine seedlings altered their nutrient use efficiency and shoot morphology under changing environmental conditions and how these changes related to their...

The identification of Douglas-fir wood

Douglas-fir is one of the largest, most abundant and widely distributed species of trees native to North America, and next to the southern yellow pines, it is cut in the greatest quantities of any wood of commercial importance. It belongs to the coniferous family and is, therefore, a softwood. Other names for Douglas -fir are red fir, yellow fir, Oregon pine, Puget...

Some characteristics of dwarf mistletoe populations on red fir

Critical appraisal of dwarf mistletoe damage and of rate of spread and intensification may depend on knowledge of mistletoe population characteristics. Studies of dwarf mistletoe (Arceuthobium campylopodum) on red fir (Abies magnifica) were made by cutting and examining 14 trees 24-86 years old (avg 58). Bole infections,...

A comparison of thinning methods in red pine: consequences for stand-level growth and tree diameter

Long-term replicated experiments that contrast thinning method (dominant thinning, thinning from below) while controlling stocking level are rare. Stand growth and tree size responses to thinning method can be useful for making decisions to achieve desired objectives, whether these are timber or wildlife habitat related. We examined data from two long-term (>50 year...

Rearing Sirex noctilio from red pine in central New York

Tomicus piniperda (Coleoptera: Scolytidae) reproduction and development in Scots, jack, red and eastern white pine under laboratory conditions

The pine shoot beetle, Tomicus piniperda (L.) (Coleoptera: Scolytidae), is an exotic bark beetle in North America that was first found in the Great Lakes region in 1992. We evaluated T. piniperda reproduction and development in one Eurasian pine (Scots pine, Pinus sylvestris L.) and three North American...

Nest trees of northern flying squirrels in the Sierra Nevada

We examined the nest-tree preferences of northern flying squirrels (Glaucomys sabrinus) in an old-growth, mixed-conifer and red fir (Abies magnifica) forest of the southern Sierra Nevada of California. We tracked 27 individuals to 122 nest trees during 3 summers. Flying squirrels selected nest trees that were larger in diameter and...

Effects of diterpene acids on components of a conifer bark beetle-fungal interaction : tolerance by Ips pini and sensitivity by its associate Ophiostoma ips

Conifer resin and phloem tissue contain several phytochemical groups, composed primarily of monoterpenes, diterpene acids, and stilbene phenolics. The effects of monoterpenes and phenolics on stem-colonizing bark beetles and their associated microorganisms have been studied to some extent, but the roles of diterpene acids are largely unknown. Diterpene acids are known...

Noncontact ultrasound detection of exotic insects in wood packing materials

Nondestructive methods for detection of wood-boring insects such as the Asian longhorned beetle (ALB), Anoplophora glabripennis (Coleoptera: Cerambycidae) inside solid wood packing materials is a valuable tool in the fight to exclude exotic insects from attacking a nation?s timber resources. Nondestructive, non-contact, ultrasound was investigated as...