SGDM Texture Extraction for hue

I am doing project on "Plant Leaf Disease Detection & Classification". In that, finally i have to classify the name of the disease that affects the leaf based on the texture values (such as correlation, homogeneity, energy, contrast ) calculated for hue component of the image. But these values shows only little fraction difference for different types of diseases. So i couldn't classify the disease name. Can anyone please tell me the idea to classify the disease name?