烟草石灰水如何做杀虫剂使用

植物图片 2019-11-19 21:39

叶子上的蓟马

烟草石灰水杀虫的有效成分主要是烟碱，通常烟叶中含烟碱1~3烟碱是速效性杀虫剂，有强烈触杀、熏蒸作用，杀虫范围较广，可防治蚜虫、蓟马、蜻蟓、叶蝉、卷叶蛾、潜叶蛾、潜叶蝇、菜青虫等害虫。

配制时，先用10千克开水浸泡1千克烟叶，放入盆内加盖密闭，浸12小时，用手反复揉搓烟草；然后再放入10千克清水中继续揉搓，待无浓汁揉出为止。将上述2次揉搓的烟草液混合过滤。另取生石灰0.5~1千克，加水10千克，配成石灰乳，也用纱布过滤。临喷前再将烟草液和石灰乳混合，搅拌均匀，并加水至60千克。如能在配制好的药液中再加入0.1{bf}~0.2{bf}的中性洗衣粉，则可增加其粘着力，效果更好。

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