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地下害虫是西吉农作物的主要害虫。1990年该县白城乡受地下害虫严重危害，面积达2万余亩，部分田块绝产。地下害虫的优势种为黑皱鳃金龟TrematodestenebrioidesPallas，华北大黑鳃金龟Holotrichiaoblia（Fald）和细胸金针虫AgriotesfuscicollisMiwa。其发生程度受不同田块，前茬作物和5～6月份的降水的明显影响。在化学防治上应可采用50％辛硫磷乳油按种子量0．2～0．3％，或60％3911乳油按种子量0．2％拌种，或以上述两种农药进行土壤处理。
Underground pests are the major pests of the Xiji crop. In 1990, the county Baicheng Township was severely damaged by underground pests, covering an area of more than 20,000 mu and some of the plots were in abeyance. The dominant species of underground pests were TrematodestenebrioidesPallas, Holotrichia oblia (Fald) and Agriotes fuscicollisMiwa. The extent of its occurrence is affected by the different plots, the previous crop and the precipitation from May to June. In the chemical control should be 50% phoxim EC seed 0.2 ~ 0.3%, or 60% 3911 EC by seed 0.2% seed dressing, or the above two pesticides for soil treatment.