Crop disease spread unstoppable

For approx 9 years, I have been constantly plowing fields trying to prevent disease spread of stemrot and clubroot. But the amount of infestation is not going down. I have set all surrounding fields to also plough or have clover. I have my farming areas spread around so they are not all together.
I am sure that I have had fields with no disease that suddenly have 25% infestation.
I have had the disease resistance tech well before this started.
Is this a bug?

Field maintenance doesn’t eradicate diseases. What does is planting a crop which is not susceptible to the diseases currently rampaging on that field (or, ideally, adjacent) ones. Clover should always work.

Here’s an up to date write up in more detail than you might possibly want:

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OMG thank you! Did field maintenance previously reduce disease (in earlier versions of the game?) . I feel like I have always been doing this wrong. This has been driving me insane.

I only looked into this properly since the 0.9.7 beta, so I’m not sure. The in-game tutorial says (or said, at least, it’s been a while since I read them) something about leaving fields empty to get rid of diseases. So perhaps it did in the past, but not for a while now. 1.0.0 also has quite big changes when it comes to crop diseases - in 0.9.7 there’s a bug that means they never actually spread.

Wait, they finally made disease spreading actually happen in the game?

Looks like anti-spread rotation triple fields’ back on the menu, boys!

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