Swiss chard is an important leafy vegetable in Ethiopia because it is full of nutrients.. Swiss chard is in trouble because of diseases like Powdery Mildew, Leaf Miner and Cercospora Leaf Spot. The old ways of finding these diseases are not good because they take a lot of time cost a lot of money and often give results. This study is about a way to find Swiss chard diseases using pictures and computer programs. We took pictures of 400 chard leaves and used 70% of them to teach the computer and 30% to test it. The computer uses a way to separate the leaves a special tool to look at the texture and a special program to decide what disease it is. When we tried it the computer was 97.5% of the time. It was right 96.7% of the time for Powdery Mildew 93.3% of the time for Leaf Miner and always right for Cercospora Leaf Spot and healthy leaves. This system is good, for farmers because it is cheap fast and can be used for plants.