Pathogens and Symptoms
The long leaf spot of banana is a kind of banana leaf spot caused by Curvularia lunata. Conidiophores dark brown or light brown, not branched or branched, with a diaphragm, apical curvature, with conidia. Conidia brown or light brown, elliptic or olive-shaped, mostly slightly curved, with 3-5 diaphragms, the majority of four, the third cell from the base is larger, the color is darker, the size is 14-34 Micron 1-11 micron, average 21 micron 6.6 micron.
Most of the bacteria were invaded by the lower leaves of the plants and gradually developed towards the upper leaves. Some of the main veins of the leaves were also affected. In the early stage of disease, many lesions were formed on the leaf margins, irregularly shaped, gray or dark grayish brown, and the direction of the main vein of the backward leaf expanded to form a long brown large spot. The center or upper part of the lesion is gray or gray-brown. There are hidden lines on the surface of the lesion, and a small black spot is formed. The lesion is brown or dark brown around the lesion, and the outer edge has orange yellow yellow halos. The victim's heavy leaves soften and sag and even die.
Incidence conditions and control methods are the same as those for gray scale disease.
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