Description

This application is skillful to diagnosis theDendrobium disease by leaf images. First, Yellow leaf spot is acommon disease of Dendrobium and it causes significant yield loss.The disease is often observed on the leaves. The first symptomsappear on leaves as small yellow oval spots. Lesions may expand toone centimeter in diameter, and are surrounded by a yellow marginwith black powder inside. Individual lesions may vary in shape andsize, often expanding and joining together with other lesions.Second, Black spot is various sizes and develops on leaves. Thefigure is quite round and be surrounded by black margin. The centreof spot is dried, and sank from normal tissue. Third, Anthracnosedisease infects by the air and the leaves are most often attacked.It changed brown beginning at the apex and proceeding toward thebase. Dark brown is expands across direction of the leaf. Theaffected area is usually sharply defined, while the remainder ofthe leaf appears normal.