Blackspot on roses
Some varieties of Roses are prone to a fungal disease called Blackspot. Symptoms include yellowing leaves with black spots. It starts on the lower leaves and works it's way up the plant when there are periods of high humidity and warm temperatures. Infected leaves will usually drop off.
1. Plant varieties of roses that are less susceptible to blackspot.
2. Plant roses is areas with sun and good ventilation.
3. When watering, water the soil not the foliage.
4. Remove infected leaves that have fallen.
5. Spray every 10- 14 days with Ferti-lome Liquid systemic fungicide when sign of the disease are present