Leaf blight of cotton
The symptom is also known as Cercospora leaf spot of cotton. It is mainly harmful to leaves. Most of the cotton infected in the late growth stage, at first produced many dark red dots on the leaves, and then expanded into nearly round, purplish red on the edge, slightly raised, brown in the middle, and produced a white mildew layer under wet conditions, that is, the conidiophores and conidia of the pathogen. The damaged leaves are easy to break.
The pathogen Mycosphaerellagossypina (Cooke) Earle is called Gossypium, which belongs to ascomycetes subphylum fungi. The ascus cavity is spherical and black, the ascospores are bicellular, the upper cells are wide, the tip is thin, and the size is 12-14 × 5-7 (μ m). The asexual state is CercosporagossypinaCoke, which is called cottontail bag, which belongs to the subphylum of semiknowns. Conidium stalk brown, with septum 1-5, size 70-450 × 4-7 (μ m), conidium whip-like, colorless, with septum 6-16, size 50-200 × 3-5 (μ m).
The transmission route and disease condition of the pathogen is that the mycelium is more and more standing on the remnant of the disease. under the humid condition in the next spring, the conidia are produced and transmitted by wind, rain and insects. Repeated infection was carried out under rainy and humid conditions or cool autumn. Cotton plants are infected by other diseases or lack of fertility, and sandy loam is easy to occur.
For prevention and control methods, see cotton ring disease.
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