Treatment for Jasmine root rot / full plant death

Crop: jasmine (3 year old)
Variety: normal, rameshvaram saplings
Date or month when noticed: may 2024
Location: thoothukudi
Climate: Rainy/sunny/cold etc.
Possible cause: dying of full plant, want to know how to stop spreading of this root roting of my jasmine plants

Do this thing destroy whole farm ?
What kind of pesticides need to use?
And the dosage
Need to know