Fusarium and Verticillium are two wilt diseases that affect the vascular system of plants. Both are soil borne and the best defense is to plant varieties that have some resistance to these pathogens. On a tomato label, you will see letters behind the plant variety, “Celebrity VFNT”. The V & F stand for resistance to fusarium and verticillium wilt. For more information on ways to deal with these wilts, here are links from K-State Research and Extension and University of Maryland Extension.
https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Fusarium%20and%20Verticillium%20Wilt%20of%20Tomato.pdf
https://extension.umd.edu/hgic/topics/fusarium-wilt-tomato-vegetables
https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Fusarium%20and%20Verticillium%20Wilt%20of%20Tomato.pdf
https://extension.umd.edu/hgic/topics/fusarium-wilt-tomato-vegetables