For employers with 401(k) plans, auto enrollment is growing, and target-date funds are an increasingly popular default option. But concern is building over what happens when the two trends meet.

Of those companies that auto-enroll workers, 39% auto-enroll new employees and 18% auto-enroll all employees, according to a survey released Wednesday by Towers Watson. Three percent of the companies polled said they planned to start auto-enrolling by 2011, and 18% said they were thinking about it.

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