Help! What's wrong with my potatoes?
This is my first time growing potatoes and i am a total noob when it comes to gardening. A few days ago my potato plant had a bit of a whitefly infestation so i looked up remedies online and found that whiteflies could be deterred by using a solution of 50% rubbing alcohol and 50% water with a bit of dish washing liquid. i tried to get as much of the whitefly eggs off by using a rag, maybe i shouldn't have done that as i bruised some leaves? So i sprayed the plant with the solution and the following morning i saw that the leaves had dark spots underneath and some of the leaves had already turned a real dark brown and have curled up. What did i do wrong? Any help would be greatly appreciated.