Dealing with Rose Diseases

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 black spot. Black spots appear as circular with fringed edges on leaves. They cause the leaves to yellow. Remove the infected foliage and pick up any fallen leaves 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 buds with wind spread white powder. It makes the leaves curl and turn purple. Spray with Funginex or Benomyl to treat this fungal disease.

3. Blistered underside of leaves

Known as rust, this disease is characterized by orange-red blisters that turn black in fall. It can survive the winter and will then attack new sprouts in the spring. Collect and discard leaves that are infected in fall. a Benomyl or Funginex spray 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...