What are the whitish blotches on my pumpkin leaves?
Thank you for your question. Your plants have powdery mildew, which is a fungus, just like bread mold. Here is an article on it and what to do: http://hortsense.cahnrs.wsu.edu/Search/MainMenuWithFactSheet.aspx?CategoryId=5&PlantDefId=55&ProblemId=219 Hope this is helpful. Good luck!