The damage to spring-sown rape should be expressed with damage index to the plant of the crop according to damage degree proposed by author in this paper.

• 通过对被害苗的详细调查归类，本文提出了油菜蚤跳甲为害的分级标准，建议以被害指数来表示该虫的危害程度，以便在综合防治中能准确的表示虫情。