Perhaps some of you can guess why or know why my plant leaves burned, but I believe that it was the insecticidal soap that I used. Not really thinking about it, I just grabbed some liquid soap and put some in a spray bottle and went to town on spraying everything showing signs of bugs or not. I have been reading up on the making of insecticidal soap and one of the issues with a soap spray is leaf burn, and that is even possible using the correct soap.

Here is what I found that seems to be consistent with other sites on this topic.

Homemade Insecticidal Soap Recipe

The simplest insecticidal soap is nothing more than a 2% soap solution. To make this at home, you will need:

  • Sprayer: Any clean spray bottle or garden sprayer will work fine for spraying insecticidal soap. Make sure the sprayer or bottle hasn’t been used for herbicides.
  • Pure Soap: Use a pure liquid soap, such as Castile, or all-natural soap. The active ingredient in insecticidal soap comes from the fatty acids in animal fat or vegetable oil, so it’s important to use the real thing. Don’t use detergents (which aren’t actually soaps), dish soaps, or any products with degreasers, skin moisturizers, or synthetic chemicals. Dr. Bronner’s Pure Castile Soap is usually pretty easy to find in stores, or check your local natural-foods store for other options.
  • Pure Water: Tap water is fine for making insecticidal soap. If you have hard water, you may want to use bottled water to prevent soap scum from building up on your plants.

To make homemade 2% insecticidal soap, mix together:

  • 5 tablespoons soap to 1 gallon of water

OR

  • 1 heavy tablespoon soap to 1 quart of water

OR

  • 3.75 ml soap to 1 cup of water
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