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自从推广杂交水稻以后,在稻区形成了一个常规稻与杂交稻并存的复杂苗情。杂交稻的晶种性状、栽培管理与常规稻不同,稻田生态发生很大变化。因此,病虫的发生为害情况也有较明显的变化。据1978年调查,晚造秧田汕优2号卵块密度达7680块/亩,而团结一号仅为2400块/亩。为探索杂交水稻三化螟发生规律,我们对杂交稻和常规稻三化螟的生长发育状况、繁殖力及螟害率进行了比较研究,现报告如下。
Since the popularization of hybrid rice, a complex seedling coexisted with conventional rice and hybrid rice has formed in the rice area. Seed characteristics of hybrid rice, cultivation and management of conventional rice is different, rice ecology has changed greatly. Therefore, the incidence of pests and diseases also have more obvious changes. According to a survey conducted in 1978, the late blooming Shanyou 2 egg mass density reached 7680 / mu, while the unity of only 2,400 / acre. In order to explore the occurrence of the three rice stem borer, hybrid rice and conventional rice stem borer, the growth and development status, fecundity and the rate of stem borers were compared, are as follows.