Symptoms: Early on the leaves showed water-soaked necrotic spots, then quickly turned dark brown, lesions on the bright, dark and white concentric ring pattern, the outer yellow halo.
Pathogen Pseudomonascichoric (Swinhle) Stapp, called Pseudomonas chicory, is a bacterium. Rod-shaped, with polar flagella.
Infection route: The bacteria live in the soil, mainly through water drop splashing or leaf-to-blade friction. The pathogens invade through wounds or water holes, and the incidence temperature is 17 to 23 degrees. The onset of production is mostly in the low temperature period.
Prevention and control:
At the beginning of the disease, the lesions were cut off in time or the diseased leaves were cut. In the early stage of onset of disease, 14% of Luoyang Bronze Solution was sprayed with 350 times of liquid, separated every 7 to 10 days, and continuously controlled for 2 to 3 times.
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