Feeding damage by larval coneworms (Lepidoptera: Pyralidae) on flowers and cones of pines can cause significant economic losses in pine seed orchards in the southern USA (Ebel et al. 1980, USDA Forest Service GTR SE-8, Asheville, NC). The south coastal coneworm, Dioryctria ebeli Mutuura & Monroe, is a common pest in seed orchards of slash pine (Pinus elliottii L.) in the coastal region of south...

To investigate properties that might be related to utilization, needles were sampled on one tree of each of the four major species. Tensile strength was measured on loblolly needles only; it ranged from 4,630 to 6,980 psi. Maximum load averaged 4.1 pounds per needle, with a modulus of elasticity of 220,000 psi. Specific gravity (ovendry weight, green vol~) of individual needles of the four spec...

Many forest management treatments are directly aimed at maintaining or enhancing forest productivity. There may also be secondary effects that detract from this goal. We discuss three case studies in Washington state in which several mechanisms may have led to adverse secondary impacts. In the first study, pulp and paper (PII) sludges were mixed into soil and growth of Douglas-fir [Pseudotsuga ...

Small interfering RNA (siRNA) induced posttranscriptional gene silencing (PTGS) has been an efficient method for genetic and molecular analysis of certain developmental and physiological processes and represented a potential strategy for both controlling virus replication and developing therapeutic products. However, there are limitations for the methods currently used to deliver siRNA into cel...

This paper presents a model for examining the economic value of biotechnological research given time-dependent changes in biotechnology. Previous papers examined this issue assuming a time-neutral change in biotechnology. However, when analyzing the genetic improvements of increasing a tree’s resistance to a pathogen, this assumption is untenable. We derive analytical expressions for the optima...

Loblolly pines (Pinus taeda L.) thut were 8 to 17 yr old tolerated one to three fus[form rust (Cronartium quercuum [Berk.]Miyabe exShiraij sp. fusiforme) galls in theirstems. Families withfourormore galls in their stems lost 2.5% or more ofthe trees by age 17. In living trees with less thanf<jurstem galls, diameter growth was comparable to that of trees with no galls. Tolerance was indicated by...

THOMAS, C. E., and PARKESOL, B. R. 1991. Simple, flexible, trigonometric taper equations. Can. J. For. Res. 21: 1132-1137. There have been numerous approaches to modeling stem form in recent decades. The majority have concentrated on the simpler coniferous bole form and have become increasingly complex mathematical expressions. Use of trigonometric equations provides a s imple expression of tap...

This paper considers potential cellulosic ethanol production from Southern slash pine (Pinus elliottii) plantations. The net energy balance (NEB), emissions and associated environmental impacts, unit cost of ethanol production, and associated changes to forest land values are calculated and preliminary results are given. The NEB is found to be positive at 2.2, meaning that for every unit of ene...

Thirty-seven bacterial strains capable of degrading peanut hull lignin were isolated by using four types of lignin preparations and hot-water-extracted peanut hulls. One of the isolates, tentatively identified as Arthrobacter sp., was capable of utilizing all four lignin preparations as well as extracted peanut hulls as a sole source of carbon. The bacterium was also capable of degrading specif...

1 Graduate Student, School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611-0410 2 Assistant Professor, School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611-0410 This study investigates the impact of carbon subsidies and taxes on the optimal forest rotation and soil expectation value for slash pine forest in Florida. We use ...