Symptoms: Early on the leaves showed water-soaked necrotic spots, and then quickly turned dark brown, the lesions have bright, dark and concentric rings on the lesion, the surrounding yellow halos.
Pathogen Pseudomonas cichoric (Swinhle) Stapp, known as Pseudomonas syringae, 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 onset temperature is 17 to 23 degrees Celsius. The onset of production is mostly at low temperature.
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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