二代二化螟为害杂交稻造成的虫伤株,常年占螟害总数的85—90％。尽管其单株损失远低于白穗和枯孕穗,但总体产量的损失却占据首位。因此,估计虫伤株损失程度,在测报和防治中有着重要的作用。 1984年,笔者对虫伤株损失率进行了测定,发现虫伤株率与损失率间有着极显著的相关关系,试建立依据田间虫伤株率估测损失程度的回归方程,供同行们参考。 该试验以杂交稻南优二号选择肥力一致的一块大田作试验区,区内以土埂隔成0.02亩的11个小区,单本栽插400穴。一代二化螟和其它病虫害及时施药控制。二代二化螟 Second-generation striped rice borer damage caused by hybrid rice strains, perennial accounts for the total number of stem borer 85-90%. Although the loss per plant is much lower than that of white spike and booting spike, the total yield loss occupies the first place. Therefore, it is estimated that the degree of insect pest strain loss, in the measurement and prevention has an important role. In 1984, the author measured the rate of loss of pest strains and found that there was a significant correlation between the rate of insect pests and the rate of loss. The regression equation for estimating the degree of pest damage based on the field was established for reference by colleagues . In this experiment, a field with the same fertility was chosen as the experimental area for hybrid rice Nanyou No.2. The area was divided into 11 plots with 0.02 mu of soil,, and 400 plots were planted. Chilo suppressalis and other pests and diseases and timely control of pesticide application. Second generation stem borer