Plant Health—Detecting Leaf Diseases: A Systematic Review of the Literature

Every year, both the demand for plant products and the population of the planet are growing. Moroccan agriculture is one of the main sectors of activity, which loses every year a percentage of the productivity of its crops due to plant diseases; which requires the protection of crops against plant diseases to meet the growing needs about the quality and caliber of food. So the only solution to decrease the percentage and to increase the productivity is the detection of diseases. From this, we can mention as problematic: depositing a laboratory facility to detect infected leaves, bearing in some countries farmers do not deposit a facility adequate to the recommendation of experts besides consulting an expert is costly and takes more time, hence it is advised to develop a new technology, particularly automated detection of plant leaf diseases, to properly monitor huge crop fields.