Opit G P, Throne J E, Flinn P W
USDA-ARS, Grain Marketing and Production Research Center, 1515 College Ave., Manhattan, KS 66502-2736, USA.
J Econ Entomol. 2009 Jun;102(3):1369-76. doi: 10.1603/029.102.0365.
We studied the temporospatial distribution of psocids in steel bins containing 32.6 tonnes of wheat in 2005 and 2006 in Manhattan, KS. Psocids were sampled in the top 0.9 m of wheat using a 1.2-m open-ended trier; samples were taken from the bin center and in the four cardinal directions at 0.15 and 0.76 m from the bin wall. In addition, a 2.4-m partitioned grain trier with 16 compartments was used to sample psocids from a 2-m-diameter circle in the center of the bins and to a depth of 1.96 m. Only two species of psocids were identified in the study: Liposcelis entomophila in 2005 and L. decolor in 2006. Densities of psocids were low immediately after bins were filled in July 2005, peaked in October, dropped to almost zero in December as temperatures decreased, and remained at low levels until the study was ended in March. In 2006, densities of psocids increased gradually from August to mid-October and declined until the study was ended in early November. During the fall, psocids were more abundant at the center of the bin and at lower depths. In October to November of both years, the temperatures and moisture contents of grain in the center also were higher than that in other locations. This is the first report of temporospatial distribution of psocids in steel bins of wheat.
2005年和2006年，我们在堪萨斯州曼哈顿市对装有32.6吨小麦的钢制粮仓内啮虫的时空分布进行了研究。使用一个1.2米开口的取样器在小麦顶部0.9米处采集啮虫样本；样本取自粮仓储粮中心以及距仓壁0.15米和0.76米处的四个基本方向。此外，还使用了一个带有16个隔层的2.4米分隔式谷物取样器，从粮仓中心直径2米的区域内采集啮虫样本，取样深度达1.96米。研究中仅鉴定出两种啮虫：2005年为嗜虫书虱，2006年为无色书虱。2005年7月粮仓装满后，啮虫密度较低，10月达到峰值，12月随着气温下降降至几乎为零，并一直保持在低水平直至3月研究结束。2006年，啮虫密度从8月到10月中旬逐渐增加，之后下降直至11月初研究结束。秋季时，粮仓中心和较深处的啮虫数量更多。在这两年的10月至11月期间，粮仓储粮中心的温度和水分含量也高于其他位置。这是关于小麦钢制粮仓内啮虫时空分布的首次报告。
