Delegation needs to be carefully managed to avoid employees feeling as though they are just being dumped on with extra work. The delegation of work needs to be handled to ensure that one employee is not being handed all the mundane and boring jobs.
One of the tricks to management is to attempt to build an environment in which employee involvement and employee empowerment are fostered so that all of your team members will be in the right frame of mind to deliver their very best effort.
If possible when delegating work, make sure that the employee understands precisely what is expected and share your idea of what the successful outcome of the delegated task will be. Tell the person also if and when you will require feedback on progress with the task. Be aware in advance of how you intend to thank and reward the employee for completion of the delegated work.