Sudden whole plant wilting without yellowing from bacterial wilt in brinjal, management.
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Bacterial wilt makes brinjal and other solanaceous plants wilt suddenly and completely while the leaves are still green, and a cut stem placed in clear water shows a milky bacterial ooze, which confirms it. It is soil and water borne, survives in soil, and is worse in warm, wet, poorly drained fields. There is no effective chemical cure, so rely on long rotation with non host crops like cereals, raised beds for drainage, grafting onto resistant rootstock where available, and using resistant varieties. Remove and destroy wilted plants and avoid moving infested soil and water between fields. Confirm resistant variety or grafting options and a rotation plan with your KVK.
In Ernakulam my brinjal wilted suddenly with the leaves still green, and the cut stem gave a milky ooze in water just as described. Raised beds for drainage and long rotation with cereals helped that plot.
A point: there is no chemical cure, so I switched to grafted seedlings on resistant rootstock in the worst field. Removing wilted plants fast and not moving that soil and water around is important.