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homeguides.sfgate.com > Garden > Gardening
Feb 12, 2018 - Chlorosis, which is the term for yellowing of plant leaves, has a few causes. Rose bush leaves exhibit a pale green or yellow color when they suffer from chlorophyll insufficiency. The insufficiency can be due to high pH levels in the soil, low iron or lack of oxygen due to overwatering or poorly drained soil.
homeguides.sfgate.com > Garden > Pest Control
Fungal Diseases. Fungal diseases may cause yellowing rose bush leaves. The first signs of the fungal disease blackspot are small round spots, which are typically red, purple or brown. Ringing the lesions are yellow halos, which spread the yellow coloring across the leaves.
My rose bushes have what appears to be rust on the leaves.
It is still blooming and putting on new growth. But leaves are
turning yellow and falling off. I planted them this spring. I have three out of eleven effected. Not side by side.