My apologies if this needs to go in the Tomato pest forum...

I have two cherry tomato plants, each in 5 gallon buckets. I have drilled plenty of holes in the bottom for drainage. Both plants are getting really tall, but a bit lanky. I have noticed that I have some fruit developing, but that I have lost quite a few blooms as well.

One of the plants has a lot of yellowing branches which are dying off and yellowing leaves.

I'm at work now, but will attach a picture after I get home.

Is there anything I can do at this point to save them or rehab them? Once a branch starts to die off, a new branch above is forming and it's nice and green.

I'm in Missouri and we have been getting really high temperatures lately. I have a greenhouse I am building, but I don't have an exhaust fan in there yet so it's reaching 100 degrees in there right now during the hottest part of the day, so I have the plants outside of the greenhouse.

Hope this information is helpful! Any insight you can give is appreciated!