I don’t water tomatoes in the late afternoon/evenings. Water sitting on the plant over night can lead to fungus related issues. As others have mentioned, spacing is key and pruning to remove low vines can be helpful. Also make sure you’re getting full sun for your plants.

A lack of calcium in your soil can also contribute to your issues. You might have to add calcium to your soil. In areas where you have to irrigate, you may not get calcium from your water supply.

Finally, I completely remove tomato vines and bad tomatoes at the end of the season. I do this by either burning the vines (if dry) or discarding with my trash. This helps eliminate any diseases by removing these from your garden area so they don’t linger until the next planting season.