论文部分内容阅读
本研究探明新余市蒙山山麓稻区水稻栽培制度不合理,虫源田、过渡桥梁田大量存在,是造成三化螟种群上升的重要原因。水稻生育期提前,二代过渡桥梁田由迟熟早稻改为一季晚稻和二季晚稻秧田为主,幼虫滞育时间较长,以及螟虫营养条件改善,是导致主害代由四代转变为三代的直接原因。三代转化率低使四代三化螟种群数量下降,为害减轻。同时,针对该地区三化螟发生规律,阐明了调整栽培制度,消灭越冬虫源,提高栽培技术,减轻螟害的措施,以及“兼治一代,挑治二代,狠治三代”的药剂防治策略。提出了第四代三化螟预报中应注意的问题。
This study proved that the cultivation system of paddy rice in Meng Mountain piedmont of Xinyu City is unreasonable. There is a large number of rice fields and transitional bridge fields, which are the important reasons for the population increase of the three rice borer. Early rice growth period, the second generation of transitional bridge fields from late rice to late rice and late rice second season late rice larvae, larvae longer diapause, and improve the nutritional status of stem borer, is the main cause of generation from the four generations into three generations direct cause. Three generations of low transformation rate of the fourth generation of three borer population decreased, damage reduced. At the same time, in view of the regular occurrence of the three stem borers in this area, the author explained the strategies of adjusting cultivation system, eliminating the overwintering insect sources, improving the cultivation techniques and alleviating the stem borers and the prevention and control strategies of “treating one generation, picking the second generation and ruthlessly cure the third generation” . The problems that should be paid attention to in the prediction of the fourth generation yellow rice borer were put forward.