[QUOTE=StonedBlownSkiller;4444832]Homemade Pesticide Recipes The Basics It is best to use any type of spray in the early morning or the cool of evening. Do not spray when temps are above° F! Your plants may "burn" or have a reaction to what you are using in excessive heat. This is known as "phytotoxicity" Always perform a test on a small portion of the plant material first. Wait 24 hours to observe any negative ...