There are 2 types of fusarium wilt. the one where bacteria gets into through the stem and the other thru the roots, this is very rare in Cannabis and in Australia generally due to its dry climate, UK yes Canada yes Australia, Southern California no, but not impossible, in both cases treat as per mold and cut the fucker out, in some cases you may keep the plant on life support by going dwc or bubblecloner, until harvest, but no more than a month at a time.
For consumption treat again as mold, smoke if you want, but many will use in in hash or cooking
ps:
The bacterium is in the soil get rid of your soil, off your property even trash it