To make sure that your prized roses remain in the best of health, simply follow these tips:
1. Black Spots on Leaves
This disease is commonly known as rose bush black spot disease. The appearance of black spots are circular with fringed edges on the leaves. They cause the leaves to turn yellow. Remove the infected foliage and pick up any fallen leaves on the ground around the rose. Artificial sprays may be used to prevent or treat this kind of rose disease.
2. Stunted or malformed young canes
Known as powdery mildew, this is a fungal disease that covers leaves, stems and the buds with a fine, wind spreadable, white powder. It makes the leaves curl and turn purple. Spray with Funginex or Benomyl to treat rose fungal diseases.
3. Blistered underside of leaves
Known as rose rust disease, this is characterized by orange-red blisters that turn black in the fall. It can survive the winter and will then attack new sprouts in the spring. Collect and discard leaves that are infected in the fall. A Benomyl or Funginex spray applied every 7-10 days may help.
4. Malformed or stunted leaves and flowers
This is caused by spider mites. They are tiny yellow, red or green spiders found on the underside of leaves where they suck the juices. An application of Orthene or Isotox may help in treating this infestation.
5. Weak and mottled leaves with tiny white webs under them
This is caused by aphids. They are small, soft-bodied insects that are usually brown, green or red in color. Aphids often cluster under leaves and flower buds and suck the plant juices from tender buds. Malathion or diazinon spray may help roses to survive this rose bush bug.
6. Flowers that don’t open or are deformed when they open.
Thrips could be the reason behind this 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.
Remember that roses are hungry feeders that require a lot of fertilizer to remain healthy bushes. By following the tips mentioned above, you will soon have disease free roses!
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