Occurred on the leaves of narcissus, the faint green macules appeared at the time of initial development, and then they expanded in a fan-shaped manner. There were yellow-green halos around, and later leaves were dry and black granules appeared.
Control methods: The disease can be stripped of dry scales before planting, and washed with dilute permanganate 2 or 3 times to prevent. At the beginning of the disease, it can be sprayed with a 1500-fold aqueous solution of 50% zinc alginate.
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