Bacterial Brown Rot
Pathogen: Pseudomonas aeruginosa
Symptoms
Dark brown discoloration in bulb scale is the characteristics feature of this disease. Browning of inner scale along with rotting is the main symptoms of disease. The rotting starts from the inner scale and spread to outer scales. Apparently, the bulb seems to be healthy, but when pressed, the white oozing is noticed from the neck. In several cases the whole lot of bulbs gets rotten giving the bad odour in storage.
Disease Development
This bacterium is soil-borne and can be readily water-splashed to the foliage and necks where it can enter through wounds.
Disease Management
Proper curing is required before storage. Use of maleic hydrazide and isopropyl phenyl carbamate (IPC) @ 20 ml/liter before one month of harvest. Neck cutting is about 2.5-3.0 cm. long above the bulb is reduced the bacterial infection. Light irrigation is required during entire cropping period.
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