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我县是川南双季稻作区。常年种植水稻120万亩左右,其中双季稻面积约80万亩。占水稻产量的70%。水稻病虫害是我县农作物病虫预测预报的主要对象。近年来,由于水稻栽培制度的改变,尤其是推广种植单一近缘的品种(或组合)和施氮水平的提高,加之我县三月下旬至四月上旬低温寒潮频繁。五、六月份连阴雨天气过程明显、九月上旬末开始的低温阴雨天气较多等不良气候的影响,水稻病害逐年加重,成了水稻病虫测报上的主要问题。尤以早稻稻瘟病更为突出。几年中,我们在“以病为主。病虫兼顾,警惕迁飞性害虫”这一病虫测报和防治策略的指导下,紧紧抓住稻瘟病的预测工作,在大
My county is southern Sichuan double cropping area. Perennial planting 120 million mu of rice, of which double-cropped rice area of about 800000 acres. Accounting for 70% of rice production. Rice pests and diseases are the main targets of crop diseases and pests forecast in our county. In recent years, due to changes in the rice cultivation system, especially the promotion of planting a single species (or combination) and the improvement of nitrogen levels, combined with my county from late March to early April cold frequent cold. In May and June, the weather was cloudy and rainy. The onset of cold and rainy weather in late September began to be more severe. The rice disease increased year by year and became the major problem in rice pest forecasting. Especially early rice blast more prominent. In the past few years, under the guidance of the pest forecasting and prevention and control strategy of “taking the disease as the mainstay and taking care of the migratory pests”, we firmly grasp the prediction work on rice blast,