One effective and all natural way to combat whitefly greenhouse pests is to apply insecticidal soap. ... Try making your own insecticidal soap with a recipe of one gallon water, 2 t baking soda, 2 t dish detergent, and 2 t white vinegar.

What is the best way to kill whitefly infestation?

A simple solution made from liquid dish soap and water will kill adult whiteflies without harming plants. Add 1 tablespoon of liquid dish soap to 1 gallon of water and mix well. Pour the solution into a plastic spray bottle and spray it on all infested plants, saturating the leaves' upper and undersides and the stems.

Can I spray baking soda on plants?

Make a typical baking soda spray by dissolving 1 teaspoon of baking soda into one quart of water. You can add a few drops of insecticidal soap or liquid soap to help the solution spread and stick to the leaves. ... Spray the plant completely, reaching both the upper and lower leaves, and let the plant dry.