Following a website, I made a fungicide for my roses using: 1 tsp. baking soda 2 tsp. canola oil 1 tsp. hand liquid soap(Softsoap Aloe Vera) water solutable fertilizer 20-20-20 1.5ml and some pepper, mix into 1 L of water. Then I sprayed the solution by RL FLO-Master 1/2G sprayer(air pressure spray). After having applied it to my roses, some of the leaves' edges became grayish. (Water would gather in the area - rot?) I am just wondering, is this problem caused by the soap or fertilizer?
