How to manage onion basal rot

This disease is a fungal disease, the highest effect of this disease is seen on the bulb of onion.
This causes white or pink colored fungus to appear at the base of the bulb.
This disease causes a lot of damage to the roots along with the onion bulb.
For the prevention of this disease, Thiophanate Methyl 70% W @ 300 gram/acre or Ketazin 48% EC @ 400 ml/acre to the plant near the roots.
Pseudomonas fluorescens @ 250 gram/acre near roots as a biological treatment.