I'm a newbie at gardening so please bear with me! I have had an heirloom tomato plant for about 5 weeks now and up until this week it was doing great! In the last few days however I've noticed some of the leaves toward the bottom and lower-middle half of the plant are turning yellow, while others are wilting as though I sauteed them. Please see the photos below:
What could be happening? I don't want it to spread to the rest of the plant, which looks super healthy and is sprouting blossoms and baby tomatoes. I have checked for bugs and can't find any; there were a ton of beetles on my jalapeno plant this morning however, which sits right next to the tomato plant. I water the plant everyday and it sits comfortably in direct sunlight. Is it getting too much water/sun? Please help!