Research has shown that Avid and Heritage together is an excellent combination of products for turf care, giving you both insect/nematode and disease control for overall turf health. Sometime specific products will have extra plant health boosting properties that can be hard to determine. The Avid + Heritage Multipack includes the Heritage WG (wettable granules) and Avid 0.15 EC.
We would suggest using Heritage G Fungicide by itself then you can use a fertilizer afterwards by a few days or even a week to not overload the lawn with chemicals.