Reply To: Is this a disease on my onion sets? Community › Community › Garden Problems › Disease › Is this a disease on my onion sets? › Reply To: Is this a disease on my onion sets? 4th April 2018 at 9:42 am #46049 JohnParticipant Hi Rhys I grew sets a few year ago and they did well until July when I noticed the white rot shown in the photo. Hope the photo helps. John Attachments:You must be logged in to view attached files.