谷子负泥虫 Oulema tristis(Herbst)是陕西榆林地区山旱地谷子栽培上一种常发性、危害较严重的害虫之一。在佳县被害株率达20～30%,南部县份均有不同程度的危害.为了解此虫的发生危害及防治措施,我们进行了调查研究,现将结果报告如下.一、年生活史此虫在我区一年发生一代,以成虫在谷子根部及土中越冬。翌年5月中,下旬谷子出苗后,即转迁到谷田为害谷苗。而后进行交尾、产卵。越冬代成虫盛发及产卵盛期在6月中、下旬。卵期5天。幼虫共4个龄期,历期19～21天,至7月上、中旬为化蛹盛期,蛹期15～ Oulema tristis (Herbst) is one of the most common and harmful pests in the cultivation of mountain drylands in Yulin, Shaanxi Province. The rate of the victim plants in Jiaxian is 20-30%, and the southern counties have different degrees of harm. To understand the occurrence and prevention and control measures of this pest, we conducted a survey and research, and the results are reported as follows. Pests occur in my area a year, to adult worms in the millet roots and winter. In May the following year, in late millet emergence, that is transferred to Gu Tian harm Gumiao. After mating, spawning. Overwintering generation of mature and spawning peak in mid-June, late. Egg stage 5 days. A total of 4 larvae period, the duration of 19 to 21 days, to July on the middle of the pupation period, pupal stage 15 ~