Several diseases can reduce yields and quality of bell, pimento, and hot peppers.
Control or prevention of these diseases is most important for profitable production of peppers. Pepper diseases are classed as parasitic or nonparasitic. Bacterial Leaf Spot Xanthomonas vesicatoria causes bacterial leaf spot on the leaves and fruit of pepper. The spots on young leaves are small, yellowish green, and slightly raised on the underside of the leaf. They often have an oily appearance.