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二化螟Chilo suppressalis Walk.是湖南水稻主要害虫之一。七十年代中期以来,虫口上升快,危害重,部分地区的发生量超历史纪录,并且由以前主要危害早稻,现在也成为晚稻的主要害虫。这种崛起的主要原因,各地都认为与杂交水稻的发展与迟熟早稻的扩种有着密切关系。为了探索该虫在杂交水稻上的发生、危害及其生物学特性,为预测预报和防治技术提供科学依据,1978—1981年我们在长沙地区并与省内部分县有关单位进行了调查研究。在调查研究过程中,除进行室内观察外,并以环境和栽培措施相同的常规水稻为对照,现整理简报如下。
Chilo suppressalis Walker is one of the main pests in Hunan rice. Since the mid-1970s, insects have risen rapidly and are seriously harmed. The occurrence in some areas exceeds the historical record and has been mainly harmed by early rice and has now become the major pest of late rice. The main reason for this rise is that it is believed by all localities to be closely related to the development of hybrid rice and the expansion of early maturity late rice. In order to explore the occurrence, harm and biological characteristics of this pest in hybrid rice, it provided a scientific basis for forecasting and control technology. In 1978-1981, we conducted a survey in Changsha area and related units in some counties in the province. In the process of investigation and study, in addition to the indoor observation, and with the same environmental and cultivation practices of conventional rice as a control, are now organized briefings are as follows.