Occurrence and Control Techniques of Tomato Scab

Chinese name: tomato scab

Latin name: Xanthomonas Campestris pv. Vesicatoria (Doidge)Dye

Damage Crop: Tomato

Symptoms of damage: mainly stems, leaves and fruits. In the early stage of diseased leaves, water-soaked spots appeared on the back of the leaves, gradually expanded into a nearly circular shape or connected to irregular brown-brown lesions, rough and uneven, chlorotic halos around the lesions, and dry and fragile in later stages. Stems first appeared as water-immersed chlorotic spots, then expanded upwards and downwards as elongated ovals, and dark-spotted lesions were slightly sunken in the center; water-soaked chlorotic spots appeared on the surface of diseased fruits and gradually expanded, with oil-immersed light in the early stages, and later appeared. Yellow-brown or dark brown corked, 0.2-0.5 cm in diameter, nearly round, rough and dead spots, some interlocking into irregular large patches, fruit shank and fruit connection damage, easy to drop fruit.

The morphological characteristics of pathogens: bacteria short rod-shaped, both ends blunt.

Classification properties: Bacteria

Characteristics of the disease: The pathogens overwinter with the diseased body in the field or on the attached seeds, and in the second year, they are transmitted to the leaves, stems or fruits by wind and rain, insects, and invade from wounds or stomata. High temperature, high humidity, heavy rain, heavy onset, extensive management, heavy infestation or storm caused more wounds, which is conducive to disease.

Control methods:

(1) The establishment of a disease-free seed field to ensure that the seeds are free of bacteria is a fundamental measure to prevent the spread of disease; seeds are soaked with I% sodium hypochlorite solution for 20-30 minutes, rinsed with clean water and germinated.

(2) At the onset of disease, use neophytin 4000 to 5000 times solution, or 200 times solution of bacteria, or 50% solution of copper acrylate wettable powder 400 to 500 times spray, spray every 7 to 10 days. Times, even spray three times.

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