We've discussed Ghassan Daghlas before. He is literally paid by the Palestinian Authority to make up stories about what "settlers" are doing. Practically none of his accusations have any proof, and many of them are proven fabrications, but they get published in Palestinian Arabic media as fact - and sometimes even mainstream journalists accept his lies at face value.
He has accused Jews many times of setting Palestinian fields on fire, and today is no exception.
He added that the fire "came on dozens of dunums planted with olive trees."
The photo accompanying the article shows a brush fire, common in the dry season, with no olive trees in sight.
Daghlas' would be out of a job if he couldn't make things up.