How do I save tomato plants from yellow spots and blight with dating tips 2025?

[JosephMG]

My tomato plants have these weird yellow spots on the leaves, I noticed them a few days ago and they're spreading to more plants. I'm watering them the same as always and they get plenty of sun. I checked for bugs but I don't see any aphids or caterpillars. I'm worried it might be some kind of blight or a nutrient deficiency. I don't want to lose my whole crop.

[PenelopeWL]

That sounds frustrating your tomato leaves turning yellow could be a fungal disease or a nutrient issue. Lower leaves tend to show problems first, so remove the worst spots and improve air flow between plants.

[Luna_H]

I'm not sure exactly what this is It could be a mix of disease and environmental stress like too much sun or uneven watering If spots are circular with brown edges it might be early blight.

[Steven_M]

In my garden a similar thing happened once and it turned out to be a fungal issue from crowded plants I thinned them spaced the rest and the spread slowed.

[NicholasHL]

Best next move is to inspect for water on leaves and water at soil level, remove infected leaves, mulch to keep soil drier, and consider a labeled fungicide if many plants are affected.