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据烟农介绍:黄烟水可治黄瓜蚜虫。采用10～30％浓度的烟叶水进行的防蚜试验,在喷后4小时调查防治效果,为
According to tobacco farmers introduced: yellow smoke cure cucumber aphids. Aphid control experiments with 10-30% concentration of tobacco leaf water were used to investigate the control effect after 4 h