菟丝子为一年生蔓性植物,无根,叶退化呈鳞片状,无叶绿素,茎呈细丝状黄红色,缠绕在亚麻植株上,以吸器吸收亚麻的养分和水分,秋季生成团状的黄白色小花,没有花梗,果实为蒴果。受害植株矮小瘦弱,枝叶枯黄,生长不良,受害轻的结实率降低,籽粒不饱满;受害严重的不能结实,最后死亡。发生菟丝子的地里亚麻常常成丛、成片、成块地被水黄色的、形如乱丝状的菟丝子所缠绕。亚麻菟丝子以种子在土壤、病残物、粪肥和亚麻种子里越冬,亚麻播种出苗后,菟丝子的种子也随之萌发,长出白色较粗的圆锥形胚根,胚根内贮存有营养和水分,供幼芽生长之用。菟丝子的芽为黄色的细丝,伸出地面后,逐渐延伸在空间随风旋绕,遇到亚 Cuscuta annuals as a creeping plant, no roots, leaves scaly was scaly, chlorophyll-free, filamentous yellow-red stems, wrapped in flax plants, to absorb the nutrients and water flax linen, the formation of clusters of yellow-white flowers Without pedicel, fruit capsule. The affected plants are short and thin, with yellowish branches and leaves, poor growth, reduced seed setting rate, incomplete grains, serious damage, and finally death. Flax linen in the field often into clumps, into pieces, pieces of water yellow, shaped like chaos filamentous dodder wrapped around. Flax dodder with seeds in the soil, disease, manure and flax seeds in the winter, flax seed sowing, the seeds of the dodder will also germinate, grow thick white conical radicle root radionuclide stored nutrition and moisture , For the growth of young buds. Dodder buds yellow filaments, out of the ground, gradually extending in the wind around the wind, met Asia