麦圆蛛蜘犤Penthaleusmajor(Duges)犦属叶爪螨科害螨,主要为害小麦,还可为害大麦、燕麦、豌豆、蚕豆、油菜、紫云英等作物和杂草。2004年3月下旬笔者在达县九岭、石桥等乡镇调查发现,麦圆蜘蛛从小麦上转移到刚栽的地膜覆盖玉米苗上为害,一般被害株率20%～50%,百株螨量最高达300 Pentaphyllum spider mite Penthaleusmajor (Duges) 犦 is a leaf mite mites, mainly harmful to wheat, but also harmful barley, oats, peas, beans, rape, asparagus and other crops and weeds. In late March, 2004, the author investigated in villages and towns such as Jiu Ling and Shi Qiao in Daxian. It was found that the wheat spider migrated from wheat to the newly mulched mulching corn seedlings, with the rate of 20% -50% The amount of up to 300