If you happen to notice small circular black spots, your plant probably has what is known as the Black Spot. The spots have fringed edges, and are a sign of a disease. Artificial sprays may be used to treat the spots, but the affected leaves should be removed from the plant, as remaining leaves will allow the disease to spread to the rest of the plant.

If you notice that the canes of your roses seem stunted or malformed, they probably have a fungal disease known as powdery mildew. Evidence of this is seen on the plant in white powder spread by the wind, and the leaves will start to curl and turn purple. It is best to treat the plant with Funginex or Benomyl to treat this fungal disease.

Also know as rust, you may notice that the leaves on your roses may have orange-red blisters on them that turn black in the fall. It is important to remove these leaves in the fall, as the diesase can survive the winter and spread to new plants in the spring. A spray every 7-10 days with Funginex or Benomyl could help.

If the leaves or the flowers of the plant appear to be stunted or malformed, you may have spider-mites living on the rose. They are easily found, yellow, red, or green spiders usually found on the undersides of the leaves, where they proceed to suck the juice from leaves. Use Orthene or Isotox to take care of the infestation.

If you see small red, green, or brown bugs under your plants, you have an infestation of aphids. Tell-tale signs of an infestation are mottled leaves and small white webs underneath the leaves. Oft-times the bugs will be found clustered under leaves or near the tender buds, where they will suck the juices. You can use Diazinon or Malathion to clear the infestation.

If your flowers don’t open, or are deformed when they open, Thrips could be the reason behind the problem. They are slender, brown-yellow bugs with fringed wings that also suck juices from flower buds. Cut and discard the infested flowers. Orthene and malathion may also treat this problem.

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