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黑缝叶(虫甲)是油菜返青至蕾苔期的主要害虫,主要以幼虫为害。近年来,随着油菜种植面积的扩大,黑缝叶(虫甲)的为害面积和为害程度也随之扩大和加重。据调查,当地油菜每年约有30～60%受害,减产10～50%,尚有部分田块因此虫为害而改种。因此,对油菜黑缝叶(虫甲)的生活习性、发生条件、为害特点等进行系统调查和研究,是准确地掌握防治适期,提高油菜生产经济效益的重要课题。
Black stalk leaves (pest) is the main pest of rape returning to budding stage, mainly infesting larvae. In recent years, with the expansion of planting area of rapeseed, the damage area and harm degree of black-leaf sedges (insects) also expand and aggravate. According to the survey, about 30 ~ 60% of local rape is harmed each year, with a decrease of 10 ~ 50%. There are still some fields that are changed by insects. Therefore, systematic investigation and research on the living habits, the conditions of occurrence and the peculiarities of the black-stalked leaves (Helmet A) of rapeseed are important topics for accurately grasping the appropriate period for prevention and control and for raising the economic benefits of rapeseed production.