陇东黄土高原苜蓿地下害虫发生规律初探

2009年至2011年，在陇东黄土高原苜蓿田，分苜蓿返青期、第一茬苜蓿刈割后、第三茬苜蓿刈割后3个时期调查地下害虫的种类、数量及不同深度分布规律。结果表明，该区域苜蓿地下害虫主要有11种，平均密度为18.2头/m2，主要类群按其所占比例大小依次为金龟甲类、金针虫类、网目拟步甲、蝼蛄类和地老虎类，优势种类为黑绒鳃金龟和华北大黑鳃金龟。

Preliminary studies on the life regularities of alfalfa underground pests in Longdong Loess Plateau

From 2009 to 2011, the species, quantity and distribution regularities of underground pests in different soil depth were investigated at turning green stage, after the first and third mowing. The results showed that there were eleven main underground pests species, with the average density of 18.2 heads/m2. Chafers, Elateridae, Opatrum subaratum Faldermann, Gryllotalpidae and cutworm were the main groups according to proportions. Maladera orientalis Motschulsky and Holotrichia diomphalia Bates were dominant species.