Answer: Tomatoes are susceptible to verticillium wilt and fusarium wilt, which are soil-borne fungi. You can plant varieties that are bred to be resistant--they have a V or an F after their names on seed packets or in catalog descriptions. Perhaps the cherry variety you planted was wilt-resistant.
Be sure to rotate your crops every year, not planting the same thing in the same place so that plant-specific diseases don't have a chance to build up in the soil. Good luck!
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