1)No you don't need put lawn seed on the spot you replacing sod. At first week if it is no good rain, you have to water it everyday. May is the time for spring sod.As late Septembers. It is not too hot yet warm enough. And in Ottawa usually there would be a week with good rain. It gives grass good time to establish before summer or winter.
2)I prefer to replace larger pieces of dying grass with sod and only using seed for thin spots to thick it up. This way has better successful rate than seeding alone.
3)You don't need to water fertilizer. The fertilizers we get in bag usually are slow release fertilizers, they slowly release over two months every time it rains.
4) Spray Killex to leafs not the roots.
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