What are the common loquat leaf spot diseases?

Loquat leaf spot is a fungal leaf spot that harms loquat. The common diseases are loquat flax leaf spot, loquat leaf spot, loquat gray spot and loquat angular spot. When the condition is serious, it can cause early defoliation and weak growth, which will affect Belamcanda. Gray leaf spot can also harm fruits, often causing fruit rot, which has a great impact on yield.

Flax wilt disease: Also known as flax wilt disease. Many seedlings occur, which often leads to the death of patches of seedlings. At the early stage of the disease, round black-purple spots appeared on the leaves, with purple-red edges, grayish white or gray in the later stage, and small black spots in the center. The size of the lesion is about 1 ~ 3 mm, the surface is smooth at first, then it becomes slightly rough, and the lesion on the back of the leaf is yellowish. If there are more lesions, they will heal into large irregular lesions. The diseased leaves withered and hung on the tree. The lesions on the vein are spindle-shaped. The symptoms on the fruit in the later stage are similar to those on the leaves.

Spot disease: the lesion is nearly round, most of which are irregular and occur along the leaf edge in a semicircle. At first, the skin lesions were reddish-brown spots, and then gradually expanded, with grayish yellow center, reddish-brown outer edge and grayish brown near the outer edge. Black spots (conidia) grow on the lesion in the later stage, which are arranged in a ring.

Gray spot disease: at the initial stage of the disease, round light brown spots appear on the leaves, then turn gray, and the epidermis is dry, which is easy to separate from mesophyll tissue. Most lesions become irregular large spots. The edge of the lesion is obvious, showing a narrow dark brown ring, and the center is grayish white to grayish yellow, scattered in black spots, thick and sparse. The damaged fruit is round, purple-brown, soaked in water, sunken and has scattered black spots.

Corneal plaque: The lesions are polygonal with veins as the boundary, and most of them are irregular large plaques. The lesion is reddish brown with yellow halo around it, and small black spots (conidiophore and conidia) grow in the later stage.