The leaves on my rose get spots and turn yellow. You have a rose that's susceptible to black spot, a fungus disease. To protect your plants, you have have to spray a fungicide. You have to respray regularly, and without fail after every rain, because the baking soda washes off. To help prevent blackspot, rake up all rose leaves in the fall and compost or dispose of them.
Black spot spends the winter on fallen leaves.
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