今年6月初我县在虫情预报准确,防治及时的情况下,仍有一部份遭受稻纵卷叶螟严重危害,卷叶率达69.3％。据调查,原因是农户使用江苏省激素研究所实验一厂生产的20％(2毫升/支)氰戊菊酯乳油稀释的浓度太低造成。说明书介绍每支(2毫升)兑水5—15公斤,有的人就按15公斤(相当7500倍)喷雾防治无效。 At the beginning of June this year, in counties, when the insect forecast was accurate and the prevention and treatment were timely, some of them were still seriously endangered by the rice leaf roller, and the leaf rolling rate reached 69.3%. According to the survey, the reason is that the concentration of fenvalerate diluted by 20% (2 ml / branch) fenvalerate EC produced by farmers in Experiment 1 of Jiangsu Hormone Research Institute is too low. Instructions for each (2 ml) watered 5-15 kg, some people press 15 kg (quite 7500 times) spray control is invalid.