Hi, 

This looks like it could be early blight which is very common for tomatoes. What do the upper leaves look like? Do they have the same symptoms? If they are looking chlorotic  like some of the yellow veining leaves towards the bottom, we would suggest a soil test to determine if the nutrients are off, especially since you say this seems to happen every year. 

You can remove the bottom leaves on the plant or any of the damaged leaves to see if that can help. Make sure you are feeding and watering regularly. 

You can also seek out disease resistant varieties in future. We would also not recommend home remedies such as baking soda since it could potentially cause more harm than good. 

Feel free to send additional photos of the top of the plant or entire plant so we can see if the symptoms are continuing up into the plant more. 

Emily

Hi Anne, 

These actually look really healthy! Despite some of the yellowing leaves, which again you can just prune those off. You may want to consider thinning the plants out a little bit but they are still looking ok. 

Overall these look like stress symptoms from the heat and potentially the planting location. They are up against the stone wall and the stones around the base so that will heat up and reflect heat to the plants and roots. Just keep watering regularly and if you haven't fertilized recently you could apply another application of a granular slower release type. 

Let us know if you have any further questions. 

Emily