Peanut brown spot

The symptoms are also known as early spot peanut disease. The main damage to peanut leaves, the beginning of a small point of chlorosis, after the expansion into a nearly round or irregular shaped spots, lesions are larger than the black spot and light color, the leaves were dark brown or tea brown, back was brown or brown There are bright yellow halos around the lesion. Humidity into the lesions can be seen on gray-brown powdery mildew layer, that is, pathogenic conidiophores and conidia. Petioles and culms lesions oblong, dark brown.

The pathogen Cercospora arachidicola Hori is called C. dicamba, a fungus belonging to the genus Deuteromycotina. There are many sub-sputans scattered in the front of the lesion, dark brown. Conidial stems clustered or scattered on bases, yellow-brown, with 0-2 septa, unbranched, straight or slightly curved, size 38-1083-6(μm), with 5-7 septal, base Round or flat cut. The sexual state is Mycosphaerella arachidis Deighton, which is called Aspergillus subglossus. Asccus shell nearly spherical, size 47.6-8444.4-74 (μm); ascaria cylindrical or rod-shaped, size 27.0-37.87.0-8.4 (μm), endogenous 8 ascospores. Ascospores twins are colorless, size 7.0-15.43-4 (μm).

Transmission routes and conditions of disease in bacteria, mycelium or

The ascospore is overwintering on the sick body. The conditions in the following year are suitable, conidiospores are produced, and initial infection and re-dyeing are carried out by means of wind and rain. Hyphae stretch directly into the intercellular space and absorb nutrients in the cells. No suctioner is generally produced. The temperature range for the growth of the bacteria is 10-33°C, and the optimum temperature is 25-28°C. The climate is rainy and wet and the disease is heavy. The onset of the disease is earlier, and the young leaves are more severe than the old leaves.

Control methods (1) Selection of resistant varieties such as flowers 39, 68-4, 8130, Luhua 11, Luhua 13, Luhua 9, Yanyu 101, P12, and Flower 17 were used. (2) See peanut leaf spot disease for other methods. Chemical control should be appropriately advanced.

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