I have tried neem oil spray but that did not help.
Yes Srikanth. They are aphids. If neem oil didn't work try alcohol water spray. One thing to remember is plants like Cabbage, knolkohl, Cauliflowers.. have a waxy coating on their leaves that prevent any of these spray from sticking on them. It is essential you add soap to it or some commercially available wetting agent or sticking agent..they also call it adjuvants.
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