Fuente: WIPO "tomato" Systems, methods, and computer programs disclosed herein relate to Receiving a digital image comprising at least one crop plant or at least one part of one or more crop plants growing in an area; Generating by using a trained neural network one or more subimages, each of the subimages comprising a one or more specific substructure separated from other substructures; Generating for each subimage by using one or more trained neural network one or more disease pixel sets classifying each pixel within the one or more disease pixel set regarding plant disease symptoms; Calculating based on the classification of the pixels in the substructure one or more disease index for each substructure.