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玉米螟Ostriniafurnacalis（Guenee）是京郊玉米上的主要害虫之一，一年发生3代，近几年为害逐渐加重，蛀孔率一般在15％左右，高的可达90％以上，影响了玉米产量与质量。为了制定其适宜的防治指标，我们对2代玉米螟危害与玉米产量损失的关系进行了研究，1984、1987年采用田间
Ostriniafurnacalis (Guenee) is one of the major pests on corn in the suburbs of Beijing. It takes 3 generations a year and its damage has been aggravating in recent years. The rate of boring is about 15% and its height is over 90% Yield and quality. In order to develop its suitable control index, we conducted a study on the relationship between the second generation corn borer damage and the loss of corn yield. In 1984 and 1987,