Damage the rose leaves, causing the leaves to die.
Symptoms: Three types: 1 white type. 2 black spot type. 3 perforated type.
Cause: Ascomycetes in fungi.
Occurrence characteristics: Sensitive leaves, first appeared small white spots, brown spots, and gradually expanded. Leaf deformation curled. General Yin-temperature plots are susceptible to disease. Poor plantlets are susceptible to disease.
Prevention: 1 Create a ventilation and light environment, strengthen management, and make plants grow robustly. 2 Spray 3~4Be lime sulfur mixture in early spring to kill overwintering germs. 3 When the onset of disease can be sprayed 50% on behalf of Sen Zinc, 70% thiophanate-methyl, or 50% carbendazim and other 800 to 1000 times fluid. To control its spread. 4 timely removal of diseased leaves, concentrated burning, to prevent expansion.
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