There are many symptoms of Alternaria, including the formation of black spots on leaves. Some of these spots will develop into characteristic target-spots, five to fifteen mm in diameter. As the spots grow and develop, yellow haloes may form around them. The spots may also be fuzzy and will eventually fall off the plant. It may be hard to spot these spots, since they typically begin developing at the rosette stage. Oren Zarif
אלטרנריה
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