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玉米螟是危害玉米最严重的害虫之一。一般年份被害率为40—70％,严重年份可达90％以上。弄清玉米螟与产量损失的关系,是制定防治措施的主要依据。有关资料曾介绍玉米螟与产量损失的关系,但因地区、发生世代、发生时期的不同,产量损失的程度也不同。我们在1985—1986两年的研究中发现,玉米螟的危害对玉米每穗粒数的减少和千粒重的损失尤为突出,是导致产量降低的主要原因。现将试验结果整理如下。
Corn borer is one of the most harmful pests to maize. The average annual damage rate of 40-70%, serious years up to 90%. To understand the relationship between corn borer and yield loss is to develop the main basis for prevention and control measures. Relevant information has introduced the relationship between corn borer and yield loss, but due to the region, generation and occurrence of different, the extent of loss of production is also different. In our two years of 1985-1986, we found that the damage of corn borer was particularly serious for the reduction of grains per spike and the loss of 1000-grain weight, which was the main reason for the decrease of yield. The test results are summarized below.