rust on roses?

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Dear gardeners:

Last year I purchased a climbing rose called "Eden" which is currently sporting a bright orange powdery substance on the underside of some leaves and the tops of the leaves are turning yellow as well.  Is this rust? and is there an organic treatment for this problem?  It appeared after I experimented with insecticidal soap.  Could that have caused the problem?  Overall, the plant is healthy with lots of new growth and many buds, but I am concerned about it's long term effect. 

I apologize if this topic has already been covered here.  I am very new to gardening, so what is common knowledge to most people on the list is news to me.