Vetter Richard S, Flanders Christopher P, Rust Michael K
Department of Entomology, University of California, Riverside, CA 92521, USA.
J Econ Entomol. 2009 Jun;102(3):1396-8. doi: 10.1603/029.102.0370.
Experiments tested the ability of newly emerged spiderlings of a black widow spider, Latrodectus hesperus Chamberlin & Ivie (Araneae: Theridiidae), to crawl through brass screen of various mesh size. The purpose was to determine whether immatures of these medically important spiders could be excluded from buildings. In horizontal orientation, black widow spiderlings were able to easily pass through mesh with openings of 0.83 mm and were prevented from passing in four of five tests with mesh of 0.59-mm openings. Spiderlings also readily pass through 0.83-mm mesh in vertical orientation. Our laboratory studies indicate that the mesh size sufficient for exclusion is too small for practical use in most cases, although there are some specialized situations where such small mesh might be useful. The results are discussed in regard to actual conditions found in typical commercial building situations.
实验测试了西方黑寡妇蜘蛛（Latrodectus hesperus Chamberlin & Ivie，蜘蛛目：球蛛科）新孵化出的幼蛛穿过不同网眼尺寸黄铜筛网的能力。目的是确定这些具有医学重要性的蜘蛛幼体是否能够被阻挡在建筑物之外。在水平方向上，黑寡妇幼蛛能够轻松穿过网眼为0.83毫米的筛网，而在五次测试中有四次，它们被阻止穿过网眼为0.59毫米的筛网。幼蛛在垂直方向上也能轻易穿过0.83毫米的筛网。我们的实验室研究表明，足以阻挡蜘蛛幼体的筛网尺寸在大多数情况下过小而不便于实际使用，不过在一些特殊情况下，这种小筛网可能会有用。结合典型商业建筑环境中的实际情况对结果进行了讨论。
