问:有农户种植的十多亩大白菜,近几天发现许多秧苗没有心了,是怎么回事?答:笔者经实地仔细查看,除了黄曲条跳甲危害成灾后,导致大白菜无头无心的情况主要是菜螟危害,无头苗附近的叶柄可明显地看到有害虫咬伤的伤痕。从周围尚未缺心的大白菜心叶里,笔者看到了长约0.8厘米左右长的菜螟幼虫,秧苗中心的叶片不久已粘连缀合。受菜螟危害后的大白菜苗不长,后期遇阴雨天气,容易导致软腐病,因而有些菜农一直认 Q: There are more than ten mu of Chinese cabbage planted in rural areas in recent days found that many seedlings have no heart, how is it? A: The author carefully view the field, in addition to the yellow beetle after the end of the disaster, leading to cabbage without head Inadvertent situation is mainly the borer harm, petiole near the headless seedlings can clearly see the wounds of pests bites. From the cabbage leaves around the heart is not lacking, I saw a long about 0.8 cm long larvae of borer, the seedling center leaves have long been sticky conjugate. Cabbage borer harm by the cabbage is not long after the late rainy weather, easily lead to soft rot, and therefore some farmers have been recognized