论文部分内容阅读
麦秆蝇是华北春麦区的主要害虫,选育抗虫品种是一种有希望的防治途径。作者等于1957—1966及1973—1978年先后16年中,在内蒙几处生产、研究单位结合其原始材料及品种试验地栽培的春小麦品种,进行了麦秆蝇产卵情况及为害率的调查。先后共调查过32次,计共1372品种次,包括867个品种(系)。本项调查均以当时推广的丰产但不抗虫的品种为对照品种,1966年前是甘肃96号,1973年后是白欧柔。抗性比较根据品种的被害指数,即其被害率与对照品种被害率的比率,以对照被害率作为100计算,共分高抗、抗、中等、感虫及高感五级,其被害指数标准依次为0—20,20.1—40,40.1—60,60.1—80及≥80.1。共鉴定出高抗级28个品种,抗级的33个品种,另外,根据1—2次调查有81个品种被害指数很低,其抗虫性值得进一步鉴定。
Straw flies are the main pests in spring wheat area of North China. Breeding insect-resistant varieties is a promising approach. The author was equal to 1957-1966 and 1973-1978 years of 16 years successively, several production and research units in Inner Mongolia combined with their original materials and varieties of cultivated spring wheat varieties tested the occurrence of spider mites and damage rate of the investigation. A total of 32 surveyed a total of 1372 varieties, including 867 varieties (lines). This survey was based on the popularized but non-insect-resistant varieties that were then popularized as the control varieties, which was No. 96 in Gansu before 1966 and No. 3 after 1973. Resistance comparison According to the variety of the index of the victims, that is, the ratio of the damage rate and the control variety, the control damage rate as 100 calculation, divided into high resistance, resistance, moderate, insects and high sense of five, the index of the victims index Followed by 0-20,20.1-40,40.1-60,60.1-80 and ≥80.1. A total of 28 cultivars with high resistance level and 33 resistant cultivars were identified. In addition, according to 1-2 surveys, 81 cultivars with low damage indices deserved to be further identified.