Aphids are small insects no bigger than 6mm. They may be white, green, or black. The little critters settle on leaves and stems of rose bushes to feed off the sap. They usually form colonies quickly, so where you notice a few, there’ll soon be hundreds. Because they feed by piercing the leaves and sucking out the sap, they can transfer diseases to a plant that may spread through an entire rose garden. Damage from aphids is easy to spot: you’ll notice leaves that are misshapen or that begin to curl. Sometimes they may hide underneath the leaves, so check both sides if you suspect an aphid infestation in your roses.
Unfortunately, cutting your roses won’t cure your aphid infestation. Here’s how to get rid of aphids on roses