Tomato plants will abort flowers for many reasons. Some of my tallest plants are still aborting flowers. Your plant, more than likely, will eventually come around and set some fruit. Good luck.

If all the plants are the same variety and only one has brown blossoms that fall off then it's not blossom drop due to too high or too low temps or high humidity causing pollen clumping.

Look carefully inside the next blossoms to open on that plant and see if you see any thrips. Or even on the browned blossoms.

In the link below just scroll down until you come to the thrip section with pictures to help.

It would also be good to know where your 7b gardening zone is.

Carolyn

Here is a link that might be useful: thrips in blossoms

Carolyn,

The link isn't working for me. I read the other post that said you lost all your favorites. . .could it have been typed in wrong?

According to the base URL, the university server is just temporarily off-line. it will be back up later.

Dave

Up and running again so you can see the pics if you want.