Resin Production in Natural and Artificial Red-Cockaded Woodpecker Cavity Trees

Resin flow was measured in red-cockaded woodpecker (Picoides borealis Vieillot) clusters in longleaf pine (Pinus palustris Mill.) in the southern region of the Angelina National Forest, Texas. Resin flow (ml) at 1.4 m height over 24 hrs was measured from one 2.5 cm punch through the phloem between 0700 and 1000 hrs from March 1999 to September 2000, for a total of 9 measurements per tree. Resin was sampled in naturally active cavity trees, artificial (insert) active, natural inactive, artificial inactive and control pines (84 sample trees). Resin flow pattern was significantly different during the year, but not significantly different in the cavity tree type resin flow. Cavity trees in the 90th percentile (>33.0 ml resin in 24 hrs) were defined as super resin producing. High average resin flows in August 1999 and September 2000 indicate when to sample resin for potential cavity trees. Regression equations were produced to estimate future resin production.

Effects of fertilization and herbicides on growth of young loblolly pine and infestations of Nantucket pine tip moth（Lepidoptera： Tortricidae）

2 岁的松种植园被选择接受化肥和除草剂的处理在 Nantucket 松尖端蛾群袭和高度，直径和卷增长的树生长参数上评估效果。氮和磷化肥， andhexazinone 和 sulfometuron 甲基除草剂在创造六个处理被使用：(ⅰ) 控制；(ⅱ) 磷；(ⅲ) 氮和磷；(ⅳ) 磷和除草剂；(ⅴ) 氮，磷和除草剂；并且(ⅵ) 除草剂。处理在 1987 和 1988 被使用。在 1987，与氮，磷和除草剂对待的树比不接受化肥处理的树有显著地更大的高度，直径和体积生长，但是没比控制树有显著地更高的尖端蛾群袭。除了氮 and/phosphorus，收到磷的处理仅仅比另外的处理有低得多的尖端蛾群袭率。在 1988，尖端蛾群袭是一致地低的，没有在观察的处理效应的差别。