Symptoms

• Small circular yellow spots appear, expands rapidly and gradually becomes light brown on leaves-Curvularia Leaf Spot
• Centre of the spots dries up leaving a sunken impression-Curvularia Leaf Spot
• Black round or oval spots develop on leaves especially during summer-Alternaria Leaf Spot
• Adjacent spots coalesce to become larger patches-Alternaria Leaf Spot
• Oval and brown small spots enlarge to become pale buff in the centre with broad and dark brown margins-Drechslera Leaf Spot
• Extensive necrosis of the edges of leaves-Drechslera Leaf Spot
• Reddish brown oval to irregular sunken spots with dark brown margin on leaves- Colletotrichum Leaf Spot
• Lesions enlarge and coalesce resulting in leaf blighting-Colletotrichum Leaf Spot
• Reddish brown fruiting bodies of the fungus appear as small dots on the affected parts

Control Measures

• Remove and destroy severely affected leaves.
• Provide shade and irrigation to seedlings.
• Spray 1% Bordeaux mixture or 0.4% Mancozeb at 45 days interval.
• If the disease is severe, spray 0.1% Contaf or Tilt at monthly interval.