Sod is a living plant and while some varieties are LOWER maintenance, all sod needs to be taken care of appropriately. Keep in mind that you are replacing your existing sod for a reason and you need to learn proper care and maintenance habits in order to keep your lawn happy and healthy all year long.
Certain times of the year create perfect grounds for infestation of insects and also breeding grounds for fungus. Remember, after installation the care and responsibility are on the homeowner. The best way to give your lawn the best possible chance for survival is to educate yourself about these issues and maintain a proactive approach to help keep your lawn looking good.
Below are good references for you to help and guide you as to proper care and maintenance of your new lawn.