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直纹稻弄蝶的幼虫通称稻苞虫,是水稻主要害虫之一。该虫70年代中期以前,在陕西稻区的丘陵和浅山区的部分稻田发生为害,发生面积约2万亩左右,目前,稻苞虫发生已增至40万亩左右。已由少量发生局部为害演变为大量发生普遍为害,成为水稻大面积均衡增产的制约因素之一。近年来,我们分析了历年资料,对其为害演变的主要原因作了一些研究,并对稻苞虫的防治对策进行了实践,现将结果整理如下。
The larva of the straight-striped rice butterfly is commonly known as the rice shell insects and is one of the major pests of rice. Before the mid-1970s, the insects were harmed in some paddy fields in the hills and shallow mountains in Shaanxi Province. About 20,000 mu of land was affected. At present, the occurrence of rice-shell insects has increased to about 400,000 mu. It has evolved from a small amount of localized damage to widespread damage in large quantities, becoming one of the limiting factors for a large-scale balanced increase of rice production. In recent years, we have analyzed the historical data and made some studies on the main causes of the evolution of the pests and carried out the prevention and control measures on the rice insects. The results are summarized as follows.