Hi Diana, 

Thanks for reaching out! You are correct - this does look like some type of fruit rot or blight on your tomatoes, but since it is not on the bottom of the fruit, it is likely not blossom end rot. Are there spots on the stems or leaves? That may help diagnose the problem. 

Here are two helpful UMN Extension articles: 

https://extension.umn.edu/planting-and-growing-guides/managing-plant-diseases-home-garden

https://extension.umn.edu/plant-diseases/insects-and-diseases-tomatoes

A few tips for managing the tomatoes:

- Keep the tomato leaves as dry as possible, and remove leaves that have leaf spots

- Remove rotten fruit from the garden and pick all fruits regularly

- Avoid contact between the soil and the tomatoes

- Make sure to plant tomatoes in a new spot each season (for at least a 3-4 year cycle), and remove all tomato plants and debris from the garden at the end of the season

I hope this helps!



Hi Diana, 

In that case, it is likely alternaria fruit rot. Click on the following link and scroll down to "Alternaria Fruit Rot" for more information: https://apps.extension.umn.edu/garden/diagnose/plant/vegetable/tomato/fruitspots.html

Good luck!