七十年代以来,随着双三熟制水稻面积的扩大,稻蓟马的发生为害日益严重.防治次数多,用药量大,农本高.为合理用药,1981年从研究不同虫量与水稻受害程度(根据为害轻重分四级)的关系出发,初步得出了稻蓟马防治指标. Since the 1970s, with the expansion of double-sowed rice area, the occurrence of rice thrips has become more and more serious.The number of prevention and treatment is large, the dosage is large, and the cost is high.In order to rationally use it, in 1981, The degree of harm (according to the severity of harm divided into four levels) of the relationship, preliminary drawn rice thrips prevention and control indicators.