Symptoms There are many sesame production areas in southern China such as Hubei, Sichuan, Jiangxi, and Guangxi. In recent years, there have also been occurrences in Henan and Xinjiang. The rate of diseased plants is 5%-40%. After the sesame seedling became infected, a dark green patch appeared on the stalk at the beginning, and then turned into a dark brown streaky spot. There were often 2-3 spindle-shaped ulcers on the tip of the tip. At the beginning, the tip of the plant was wilting and the lower leaf was withering. Loss of water, when the disease is light, it can be recovered at night, and it will not recover after a few days. The vascular bundle becomes brown when it is cut open. It soon spreads to the pith and shows empty holes. Bright particles, the root becomes brown, fine roots rot. The veins of the diseased plants showed dark green streak, vertical and horizontal cross-reticulation, transparent oil-immersed to light observation, veins in the back of the leaves showed yellow wavy distorted protuberances, and later diseased leaves were folded or browned to death. The pods were initially immersed in water-like lesions and became brownish-brown spots afterwards. The pods were thin and the seeds were small and could not germinate.
The pathogen Pseudomonas solanacearum (Smith) Smith refers to Pseudomonas alba, a bacterium. For morphological characteristics, see Peanut bacterial wilt. The bacterial and peanut bacterial wilt is the same pathogen, but the pathogenicity of the two are different, there are special physiological phenomenon. According to reports in Hubei, no wilting was found in sesame seeds supplemented with peanuts.
Transmission routes and pathogenic conditions The pathogenic bacteria mainly infest the soil with the diseased body and invade from the wound or natural orifice at the base of the root or stem. The field temperature of 12.8 °C began to infect the bacteria, in the range of 21-43 °C, the temperature increased, hair
Severe illness. In the field, it is mainly spread by irrigation water, rainwater, underground pests, farm implements or agricultural operations.
Control methods (1) selection of disease-resistant varieties. (2) More than 2-3 years rotation of sesame and grass crops or cotton and sweet potatoes. (3) Strengthen management of sesame field, timely drainage after rain, and prevent moisture from staying. Avoid flooding. (4) See other methods for peanut bacterial wilt.
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