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I noticed this when talking to Barnabas.



I decided to capture a wisp, bring it to my house, trap it and use it for my farm to see if he was right.
You can see how it went here: Imgur album or here: YouTube.

...
if only Wisp can regrowth Apply, Berry and such ... =3= ...

Interesting!

I've had my farm set up like the last picture in the the gallery for about 30 more harvests now and haven't had any diseased plants at all. I was worried that the game might reload my house zone and respawn the wisp outside the cage but that hasn't happened either. I will feel really stupid if this isn't a feature at all, but the wisp light seems to affect the plants you grow, so I would recommend placing a wisp near your farm.