Answer: Rose stems are favorites of aphids, so I'll bet that's what the problem is. Aphids congregate on succulent new growth and feed by sucking the fluids out of plants. The first line of defense is to hose them off with plain water. If you encourage ladybugs to visit your garden, they'll feed on the aphids. (Try to have something in bloom at all times in your garden to attract beneficial insects like ladybugs.) If you don't see any ladybugs feeding on the aphids, and water from the hose won't keep the pests at bay, you can control aphids with insecticidal soap sprays.
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