榆四条绵蚜(群众叫根蚜)是造成我地区高粱“黄病”的因素之一。近几年来,我公社作物受害面积多达3,000亩以上。据了解,此虫在沈阳、辽西等部分地区也有发生。为防治榆四条绵蚜的为害,我们对它的形态、发生规律及防治方法等进行了初步调查研究,结果如下: Elm four cotton aphids (masses called root aphid) is one of the factors that contribute to the “yellow disease” of sorghum in my area. In recent years, the crop area affected by the Commune has reached more than 3,000 mu. It is understood that this insect in Shenyang, Liaoning and other parts of the West have occurred. In order to control the harm of four cotton aphids in Ulmus, we conducted a preliminary investigation of its morphology, occurrence and prevention and treatment methods. The results are as follows: