猪殃殃俗称拉拉藤,又名粘粘草、蛇壳草、麦蜘蛛,属茜草科一年生或越(二)年生草本植物。猪殃殃广泛分布在全国各地,以黄河流域以南地区发生较重,在东北、华东也有发生。主要为害麦类、蔬菜、油菜、烟草、棉花等农作物,其对冬麦区麦田危害较重,尤以华北及淮河流域地区麦田危害最重,一般造成冬小麦减产15%~31%。一、形态特征猪殃殃为直根系,茎多自基部分枝, Galium calamus, commonly known as Lalatu, also known as sticky grass, snake shell grass, wheat spider, Rubiaceae annual or Vietnam (b) of the annual herb. Pigs are widely distributed in all parts of the country to the south of the Yellow River basin occurred heavier in the northeast and east China have occurred. The main crops are wheat, vegetables, rapeseed, tobacco and cotton, which harms the wheat fields in the winter wheat area, especially in the wheat fields in the North China and Huaihe River basins. The winter wheat yield is generally reduced by 15% -31%. First, the morphological characteristics Galium apricot straight roots, stems and more from the base of branches,