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Sci Tech
Bacterial blight in pomegranate
THE DISEASE is caused by Xanthomonas campestris. Characterestic symptoms of the disease are:
Small, irregular, water soaked spots are 2 to 5 mm in size with necrotic centre of pin head size.
Spots are translucent against light.
Later, these spots turn light to dark brown and are surrounded by prominent water soaked margins.
Numerous spots may coalesce to form bigger patches.
Severely infected leaves may drop off.
On stem the disease starts as brown to black spot around the nodes.
In advance stages of nodal infection girdling and cracking of nodes lead to break down of branches.
Brown to black spots appear on pericap with L and Y shaped cracks.
The disease spreads as the bacterium survives on the tree as well as in diseased fallen leaves.
High temperature and low humidity favours the disease. The disease spreads to healthy plants through wind splashed rains and in new area through infected cuttings.
The infection can be controlled by:
Adopting clean methods of cultivation
Orchard sanitation
Spraying Biomycin 0.05 per cent or Bacteriomycin 0.01 per cent or Streptomycin 0.01 per cent.
Spraying Copper Oxychloride 0.3 per cent or Bordeaux mixture 1 per cent.
S. Vanitha & M. Suresh
Regional Research Station
Paiyur-635112
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