I am going to show you how to make simple and effective organic pesticide using only common nettle plant (Urtica dioica). It doesn't contain any harmful ingredients, but it can cure plants very effectively from plant louses.
Step 1: Ingredients
All you need is a full hand of common nettle, 1.5L bottle and water. Later you will also need a coffee filter, a funnel and a sprayer (for spraying plants).
Put the nettle int the bottle, than poor the water in (about 1.5L) and leave it at least for 1 week.
Poor the liquid in the sprayer through the coffee filter and there you have it. You can use it against plant louses. Don't be discouraged by the smell of this pesticide. It doesn't smell very nice but your plants will be happy.