Blossom drop can be caused by too hot or too cold conditions (see the FAQ in the main tomato forum for more details). I do know from other forums I post at that many growers in Ca have been having a less than great season this year due to the high temps (days in 90s and above and nights mid 70s and above).

Are your temps cool _this_ summer?

The lower stems with the wart like lesions are probably just showing some development of root primordia (do a search on root initials or primordia on this forum for more info).

Tbe yellowing leaves could mean a number of things. Take a look at the Tomato Problem solver thread.

Hi -

I'm in SF proper and am having some similar problems re: wart like leisons on my heirloom tomatos. Are the veins of the leaves turning purple?

If so, you are suffering from a Psyllid infestation. They're similar to Aphids, but inject a toxin that posions the plant which turns the leaf veins purple. That seems to be a problem here in SF this year.

Ladybugs may or may not eat them, but a suggested fix is to apply sulfur - I went down to Plant-It-Earth (Market St near Noe) and got a bottle of 'Safer' fungicide which is basically a sulfur solution and a bag of ladybugs. The fungicide seems to help, although it pissed off the ladybugs enough they left me... I'm going to apply one more dose later this week, and then get another bag of Lady's on the weekend to finish off the problem.

Hope this helps,

Trowa