Septoria is a plant fungal disease that causes numerous leaf spots on your plants. This type of disease is common to the cane berry family, namely blackberry, dewberry, blueberry and raspberry. It may not be a destructive disease but ignorance may cause severe weakness to your plants, then eventually plant demise. One way of preventing septoria is by selective pruning in which you can cut out old canes so that new ones could grow.

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Source: Gardening Know How