Tobacco tea Nicotine is one of the most lethal poisons known. It interferes with nerve transmission - brain, blood pressure control, muscle control. Most insects seem not to become immune to it, except for a few beetles that feed on tobacco. Black Leaf 40 was 40% nicotine. A pint (450ml) was enough to kill an entire stadium of people. That's why it's off the market. Tobacco tea would be much less lethal. Imidacloprid is much less toxic to mammals than is nicotine. But - Tobacco grown for smoking is almost 100% infected with tobacco mosaic virus. Tobacco tea would spread this virus. This virus can infect many different plants. I have no knowledge of whether it would be safe on Hyacinthaceae, Amaryllidaceae, Iridaceae or our other favorite families. Leo Martin Phoenix Arizona USA