Can I use diprosone (betamethasone dipropionate) ov cream on fungal infected scalp?

No. Diprosone (betamethasone dipropionate) is a corticosteroid anti-inflammatory cream; it will make a fungal infection worse. Fungal infections of the scalp usually require an oral antifungal, because creams & lotions can't penetrate the hair follicles where the fungus is located.