Symptoms mainly harm pods and beans, but also damage leaves and stems. Infected at the seedling stage, a brown to auburn round spot and a moire pattern appear on the sub-Gib. The true purple leaves have a round, round, small dot that spreads to form a polygonal brown or light gray patch. The stalks became infected and formed a long strip or spindle-shaped reddish-brown spot, and the severed stalk became dark purple, with a sparse gray-black mold layer. The beans are shaped like purple spots and are shallow and deep inside. The shape and size of the bean granules are variable. They are only limited to the seed coat and do not penetrate deep inside. Symptoms vary greatly depending on the species and the time of onset. They are mostly purple, some are blackish, and they form light purple patches around the umbilicus. Severe whole beans turned purple and cracked.
The pathogen Cercospora kikuchii (Matsum. et Tomoyasu) Chupp. Chrysanthemum pyrethrum is a fungus belonging to the subphylum Fungi. Small, conidiophores clustered, unbranched, dark brown, size 45-2004-6 (μm). The conidia are colorless, whip-to-cylindrical, slightly apical at the tip, separated, more than 20 or more.
Transmission routes and pathogenic conditions The pathogens latent in the seed coat with mycelium or overwintered with mycelium and conidia on the diseased body, becoming the primary source of infection in the following year. If the seeds of the seeds are seeded with vegetative seeds, the incidence of Ziji is caused, and the conidia produced on the diseased seedlings or leaves are initially infested and reinfested by wind and rain. Soybeans at the flowering stage and the weeding stage have high temperatures and high temperatures, with an average temperature of 25.5-27°C. The incidence of disease is heavy; incidence above or below this temperature range is mild or non-pathogenic. Continuous crops and early maturing species are more severe.
Control methods (1) Selection of disease-resistant varieties, the production of anti-virus disease resistant varieties against purple spot. Such as Heilongjiang No. 41, Tiefeng No. 19, Chuxiu, Huachun No. 18, Fengdihuang, Yuejin No. 2, No. 3, Xuzhou 424, Pei County Dabaijiao, Jinghuang No. 3, Xiaohan Wang, Zhonghuang No. 4, Changnong 7 No.2, Kehuang No.2, Wenfeng No.3, No.5, Fengshou No.15, Jiunong No.5, No.9, Oxtail Yellow, and Xiong 65(9). (2) Use disease-free seeds and conduct seed treatment with 0.3% 50% Formamide or 40% Dafendan. (3) Soybeans should be ploughed in a timely manner after harvest to accelerate the decay of the diseased body and reduce the initial infestation source. (4) Spray 30% basic copper sulphate suspending agent 400 times or 1:1:160 times Bordeaux mixture, 50% polymycin wettable at the beginning of flowering, budding, podning and tenderling. Powder 1000 times, 50% benomyl WP 1500 times, 36% thiophanate-methyl suspension 500 times, about 667m2 spray good liquid about 55L.
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