Insect Pest and Disease

1. Red Scale

– Affect in Sept-Oct and sucks the sap of the new shoots

– Can be controlled by spraying Parathion 0.05%

2. White ants

– Damage the root system

– B.H.C. 5% 2.5-5 gm/pit at planting time

3. Aphids

– Affects in the leaves and buds during winter months

– Buds fail to open

– Suck all sap and discolor leaves

– Malathion 0.1%

Diseases

1. 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.

2. 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.

3. 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.