Roseblush1, I have also had leaves turn brown when using very dilute solutions of dish soap and water. After more research and finding information from an agricultural extension, dish soap like Dawn is actually dish detergent and not similar to insecticidal soap. While it may kill soft bodied insects (or perhaps just wash them away) it is not very safe for plants. Liquid handsoap is much closer to an actual soap, potassium salts of fatty acids, and will be safer for plants. I believe even better than handsoap would be a liquid castile soap because it is a true soap. If you already have castile soap that would be the way to go, but it costs about twice as much per oz as actual insecticidal soap concentrate. After all my research I plan on biting the bullet and spending $10 on 16 oz of insecticidal soap concentrate that will make over 6 gallons of spray. I hope this information helps others desperate to safely rid their plants of aphids
