Confusion is a hazard in Pikmin 4 form of a purple gas that makes affected Pikmin to move around the enemy that used it on them with their stems having that purple gas in them. They also don't respond to the whistle. And won't get out of its control until something happens to enemy like upon defeated, stunned and etc.
Sources
Confusion does not appears by itself but by the two enemies below.
- Groovy Long Legs – the boss that emits gas at Pikmin to confuse them.
– enemies that uses a gas to confuse Pikmin.