Submitted by akanksha on Fri, 29/01/2010 - 13:05
Posted in
Early Blight of Potato
- This disease is more common than late blight and causes about 20-30 % damage to crop every year.
- It can occur anywhere at any crop period.
Causal Organism: Alternaria solani
Symptoms:
- The spots of this disease on the leaves are brown to black with concentric rings.
- These spots are in numerous numbers and are scattered all over the leaves.
- Heavily infested leaves fall off after drying.
- Spots also appear on stems.
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Control Strategies:
· Plant disease-free seed
· Maintain good soil fertility and crop vigor
· Harvest when skin is mature to avoid bruising and in turn infection of tubers
- Crop debris should invariably be destroyed by burning after harvest.
· Avoid continuous potato rotations (i.e. planting potatoes in subsequent years in the same field)
- Spray Mancozeb + urea solution i.e. at the rate of 2 g Mancozeb 75 WP + 10 g urea per litre of water at 15 days interval when symptoms start.
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