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一、晚稻中后期主要病虫鼠发生趋势。根据当前晚稻主要病虫发生实况,结合气候条件、历史资料等综合分析,预计广西晚稻中后期主要病虫鼠总体发生程度为3(5)级。与上年同期相比,稻飞虱、稻纵卷叶螟发生略重,三化螟发生偏轻。具体发生趋势如下:1.三化螟。第四代三化螟发生程度将达1(3)级,发生面积200万亩,重发区域在桂中、桂东及桂西南部分稻区。2.二化螟。预计在桂林市北部及右江河谷局部稻区发生为害,发生程度为1(3)级,发生面积50万亩。
First, late rice pest and disease occurred in the late trend. According to the current occurrence of major pests and diseases in late rice, combined with climatic conditions and historical data, it is estimated that the overall incidence of major pests and diseases in late-late rice in Guangxi is 3 (5). Compared with the same period of last year, rice planthopper, rice leaf roller occurs slightly heavier, yellow rice borer is partial light. Specific trends are as follows: 1. Borer. The third generation of stem borer will reach 1 (3) level, with an area of 2 million mu, with recurrent areas in Guangxi, Guidong and southwestern part of Guangxi. Borer The damage is expected to occur in some rice areas in the northern part of Guilin City and the Youjiang River valley with a magnitude of 1 (3) and an area of 500,000 mu.