We've 10 different types of roses in out backyard...one of them has many of
its leaves turning yelloe to white.

It could be iron chlorosis, which is common in roses. It results from the
plant's inability to absorb iron (more prevelant in alkaline soil). This
particular rose may be more susceptible than your other roses. Chelated iron
can be applied as a foliar spray for quick results or added to the soil for a
longer lasting effective.
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