If you notice some webbing within the foliage like spiders do, it could be spider mites. It could be other small insects as well. I recommend getting some Bayer Tree and Shrub granules and apply it as directed on the label for container grown roses, ornamental shrubs. If only the lowest leaves are effected, it is easier for soils dwelling insects to attack them even in pots/containers.
Answered on August 9, 2015
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