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自1977年起,我省北部诸县开始推广种植杂交水稻,面积逐年扩大,至1981年晚造,当地的杂交稻一般都达到水稻面积的50％左右,个别县则接近90％。由于大面积推广杂交稻,田间食料条件的改变,从而导致当地晚造三化螟为害猖獗(1977—1981)。如始兴县自1977年以来,晚造部分秧田、早插本田的枯心率达30.7—50.3％,亩枯心群最高达500个以上,第四代白穗率高的达25.0—43.5％;南雄县1978年晚造因疏于防治,平均白穗率7.3％(其中杂交稻螟害加杈平均为13.5％),最高达60％以上,损失稻谷12万担;连山县太保公社1981年第四代测灯诱蛾量相当于1980年同代的3.36倍,当造平均白德率为12.65％,等等。调查表明,当地三化螟的为害情况比一
Since 1977, the planting of hybrid rice has been promoted in all counties in the northern part of our province. The area has been expanding year by year. By late 1981, local hybrid rice generally reached about 50% of the paddy area and nearly 90% in some counties. Due to the large-scale promotion of hybrid rice, changes in food conditions in the field, resulting in local late rice borer damage (1977-1981). For example, in Shixing County, late late part of the seedling field had a withered heart rate of 30.7-50.3%, a maximum of 500 or more mu blight groups, and a 25.0-43.5% fourth generation white spike rate. In Nanxiong County, due to neglect of prevention and control in the night of 1978, the average white spike rate was 7.3% (of which the average annual rate of hybrid rice stem borers was 13.5%), reaching as high as 60% or more, resulting in a loss of 120,000 tons of rice. Lianshan County CPIC The fourth generation of light-trapped moths was 3.36 times more than their 1980s counterparts, with an average of 12.65% when making them. The survey shows that the damage situation of the three borer than the local one