What a shame! I've had rose buds and blooms look like this after the buds are fried by a heat wave or frozen by frost, but it happens only occasionally and not year in and year out. Have you tried moving the rose to a new location? I know the other roses near it look fine, but maybe it's just the soil immediately around this plant that's the problem. Those bugs that once infested the plant may still be living in the soil and depleting the strength of the bush from underground.
