马栏林区红脂大小蠹及天敌昆虫诱捕效果研究
Trapping Effects of Dendroctonus valens and Its Natural Enemies

对陕西省旬邑县马栏林场8个林区小班红脂大小蠹（Dendroctonus valens）进行诱捕及数据分析，对每个诱捕器内红脂大小蠹的平均变化数进行了数学模拟回归，并建立了数学模型。结果表明，红脂大小蠹成虫及天敌昆虫的发生均呈“S”变化，其最高日出虫时期在6月上旬。“S”形变化曲线具体分为缓慢增加期（3月下旬-4月下旬）、快速增加期（5月上旬-5月下旬）、快速减少期（6月上旬-6月下旬）和缓慢减少期（7月上旬-7月下旬）4个阶段；红脂大小蠹雌虫总数以及日出虫数均高于雄虫，且高峰期早出现2 d左右。成虫总数也高于天敌昆虫数量，高峰期早出现2 d。
Trapping test was conducted in Malan Forest Farm in Xunyi, Shaanxi Province. Relative data were analyzed. Average variation number trapped was analyzed, and a mathematical model was established. The occurrence of D. valens and its natural enemies varied in S-shape. The highest period of occurrence was in early June. The S-shape variation could be divided into the 4 stages: slowly increasing period (late March to late April), rapidly increasing period (May), rapidly decreasing period (June) and slowly decreasing stage (July). The female over numbered the male, and its peak number appeared about 2 d earlier than the later. D. valens overnumbered its natural enemies and 2 d earlier in occurrence of maximum number than the ememies