Whiteflies commonly attack vegetable and landscape plants and can be difficult to control. They attack plants by feeding on the sap, causing yellowing, or even death of the plant if it is heavily infested. Whiteflies congregate on the undersides of leaves, where they also lay their eggs. They multiply quickly, so it is essential to get them under control as fast as possible. A homemade insecticide for whiteflies can be helpful to get them under control and out of your garden.
Whitefly Insecticide Recipe
You can mix up a simple recipe for an insecticide spray for whiteflies right in your kitchen. First, make a base mixture with 1 tablespoon of regular dish soap (not one with added bleach or an antibacterial soap) and 1 cup of vegetable oil. Pour it into a bottle that can be sealed, and shake well to mix. Note: This recipe must be diluted before using it on your plants.
Diluting the Recipe
Now that you have your base, you can mix 1 1/2 teaspoons of it into a cup of water. Mix this in a spray bottle, and shake it well. Oil and water do not mix, so it needs to be shaken often as you are using it.
Using the Spray
Once your spray is properly diluted and mixed, you can spray your affected plants. Be sure to spray the undersides of leaves, since this is where the whiteflies tend to be. This mixture kills adult whiteflies and smothers the larvae and eggs as long as they are covered in the spray, so be sure to apply it liberally. Reapply as needed after rain or watering your plants for the best results. Be sure to spray plants early in the morning or late in the day when temperatures are cooler, as the heat may cause an adverse reaction in your plant.
Another recipe, from The Old Farmer’s Almanac, recommends a mixture of five parts water, two parts rubbing alcohol and 1 tablespoon of dish soap. Mix well, and spray it on the leaves of affected plants. You might want to test this on one leaf first, in case the rubbing alcohol is damaging to the plant.
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