I think that this may be a better version of the image. Image is 790x444, make your browser wide enough for best view.
For the "smoke" to be such a wide trail at the aircraft a large fire would seem to be necessary. There is no sign of fire at the crash site.
Grass, not smoke.
This is still a very poor image, 20k jpeg. Someone may well have a better one.
Source -
"https://www.srf.ch/var/storage/images/_aliases/944w/auftritte/news/bilder/2018/08/05/node_16198592/178592648-2-ger-DE/bild.jpg"