- Die Back (Diplodia rosasium): Very serious disease of roses and appears after pruning.
The drying up and blackening of pruned shoots extends downwards.
Control: Pruned cut end should be painted immediately with fungicidal paint.
- Black sport (Diplocarpon rosae)
– Affect in Nov-March, circular black spot in the leaves (<1cm size)
– Leaves becomes chloritic, dry up and drop
Control: Spraying 0.2% Captan.
- Powdery mildew (Sphaerotheca pannosa)
– Affect in warm humid and cool weather
– Young shoots and leaves are covered with white powdery growth
– Flower bud fail to open
Control: Dusting 50% Sulphur.