Is this blight?
I'm growing tomato plants in 5 gallon buckets of potting soil with drainage holes and rocks in the bottom. Two of my plants, a Yellow Pear and a German Stripe, have yellow leaves. The first time I noticed, an entire branch of leaves had gone yellow. They are on the lower half of the plants. Most are at the bottom but one was midway up.
I applied Osmocote time release fertilizer at planting and water every day when temps in the 80s; otherwise I water every other day or when they feel dry.
I checked the forum and other tomato disease guides but none of the photos looked quite like these leaves, so I'm still not sure how to treat this.
I'm in western Oregon. The temps just got into the 80s this week, and the plants have just started setting fruit.
If anyone can identify what this problem is and suggest how to fix it, I'd be most appreciative.