Many common pests and diseases that affect roses can be controlled without resorting to chemical pesticides. Inspect plants regularly to detect any diseases or pests before they become a problem. Become familiar with the pests and diseases that are common in your area. Before you treat plants for insect problems, look for beneficial insects (good bugs) such as ladybugs, lacewings, syrphid flies, and orange-and-black soldier beetles. If you see these natural enemies of rose pests in your garden, don’t use an insecticide, because you are likely to kill more beneficial insects than pests. (See Less-toxic Chemical Controls.)