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二化螟是我省一季中稻区重要害虫之一,近年来,二、三化螟混合发生的昆明、玉溪等滇中地区,由于栽培技术和耕作制度的不断革新,以及重点药治三化螟的结果,二化螟的为害和虫口基数均有回升,常年给稻谷带来一定损失,如第一代所造成的枯心率一般均在百分之一以上,而最高的可达百分之十五以上,实是确保稻谷增产丰收的一大障碍。
Chilo suppressalis is one of the most important pests in the first season rice planting area in our province. In recent years, Kunming, Yuxi and other central Yunnan areas, where the second and third generations of rice stem borers are mixed, due to the continuous innovation of cultivation techniques and farming systems, Of the results, the damage of Chilo suppressalis and insect population base have rebounded, perennial bring some losses to rice, such as the first generation caused by the dry heart rate are generally more than one percent, while the highest up to ten percent Five or more, in fact, is a major obstacle to ensuring paddy yield increase.