There are disclosed novel ether compounds of the general formula:
 wherein R1, R2 and R3 are each hydrogen or the like; A is a group of the general formula:
 B is a group of the general formula:
 and X is oxygen or sulfur; and harmful-organism controlling agents containing them as active ingredients.
                            本发明公开了通式如下的新型醚化合物
 其中 R1、R2 和 R3 各为氢或类似物;A 为通式中的基团:
 B为通式中的基团
 和 X 是氧或
硫;以及含有它们作为有效成分的有害
生物控制剂。