Treesearch

The Nantucket pine tip moth, Rhyacionia frustrana (Comstock) (Lepidoptera: Tortricidae), is a common regeneration pest of pine plantations in the southeastern U.S.A. The insect has two to five generations annually depending on climate (Fettig et al. 1999a, USDA For. Serv. Res. Pap., In press). Following oviposition and eclosion, first-instar larvae bore into needles and begin mining between the epidermal layers. Resin from this boring is the first visible sign of tip moth infestation but is often difficult to detect. Second-instar larvae feed at needle and bud axils and produce a web which...

The monoterpenes of about 16,000 xylem resin samples of pine (Pinus) speciesand hybrids—largely from the western United States—were analyzed in this long-term study of the resistance of pines to attack by bark beetles (Coleoptera:Scolytidae), with special emphasis on resistance to the western pine beetle(Dendroctonus brevicomis). The samples were analyzed by gas liquid chromatography, and the results reported are expressed as normalized monoterpene composition. Optical isomers were not separated. The studycovered (a) 19 pine species in California, (b) 86 pine hybrids and 26 parentspecies...

Temperature is the major uncontrollable climate variable in plantation forestry. Matching plants to climate is essential for optimizing growth. Matching is usually done with field trials because of the lack of a predictive relation between laboratory measurements of physiological responses and climatic factors affecting growth. This paper evaluates the potential of using respiration parameters for selection of appropriate drainage or seed sources within a drainage for superior growth in a particular climate. The growth traits measured are tree height, stem diameter and stem volume. The...

Despite population growth in urban areas and increasing diversity nationwide, there appears to be little diversity among wilderness visitors in the United States. Frequent users are almost exclusively white (Chavez 1993a; Ewert 1998; Hendon 1991; Parker and Winter 1998), male (Chavez 1993a, 1993b; Ewert 1998), between 30 and 40 years of age on average (Chavez 1993a; Cole et al. 1997; Ewert 1998), well educated (Chavez 1993a, 1993b; Hendon 1991; Parker and Winter 1998; Roggenbuck and Watson 1989), and from urban areas (Roggenbuck and Watson 1989).