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水稻螟虫是我省病虫害防治中,历年用药次数最多,用药面积最广,用药量最大的防治对象。年年大面积的重复施药,对水、桑、鱼的污染十分严重,而成为必须解决的突出问题。70年代中期后,二化螟已成为优势螟害虫种,加之早栽水稻面积的增多,一代二化螟巳成为重点防治世代,药剂防治面积急剧增大。因而,研究低剂量施用25％杀虫双水剂具有重要意义。根据一代二化螟初期为害部位低,和水面极为接近,以及当时气温较低,发育较慢,抗药力相对较弱的特点,1985年以来,我们在宜宾县、南溪县、江安县,多年、多点研究了按常规
Rice stem borer is the prevention and treatment of pests and diseases in our province, the number of drug over the years, the most widely used drugs, the largest amount of control targets. Repeated application of large areas every year, the water, mulberry, fish pollution is very serious, but has become an outstanding problem to be solved. After the mid-1970s, the stem borer has become the dominant insect pest species, combined with an increase in the area of early-planted rice, the generation of stem borer has become the focus of prevention and control generations, the rapid increase in the area of prevention and treatment of pesticides. Therefore, the study of low-dose application of 25% pesticide double agent is of great significance. According to the characteristics of low damage area and extremely close water surface of the first generation of stem borer, and low temperature at that time, the development is slow, and the resistance is relatively weak, we have been in Yibin County, Nanxi County, Jiang’an County for many years , More research by conventional