Awesome, this type of App is great. Now only with a photo can diagnose what disease affects plants. It seems to me that it would be very useful for every farmer, a person who starts in agriculture or gardening and even for professionals, you never know them all and an extra little help is always good. But it generates a doubt: only through an image? I imagine you must have a geolocation system or other tools to base your verdict on the pathogen; remember that diseases and their development in the plant are greatly impacted by the type of environment and / or edaphoclimatic conditions surrounding the plant.