First can you post pictures? It might help to better identify what is wrong. Next, why did you use roundup? For weeds? It sounds like there are a lot of chemicals being used. Like I said though pictures would help.

Happy Gardening,
-Kristina K.

Here is a link that might be useful: Urban Farm Wife

As always a picture sure would help. I aaume these are in a container ?Holes in the bottom ? Your soil mix is too water retentive.Peat,manure,and old soil (compacted) and clayish soil all hold too much water. You are drowning your plants ,keeping the roots constantly wet will result in root rot and makes it so the plant cant take up water even tho there is plenty available.A soil mix with larger particles will allow better drainage,allowing air to get to the roots.

The yellowing/white at the base of the leaves is due to drift from the glyphosate in Roundup. Tomatoes are affected by very small quantities!

Here's an image and discussion from Clemson University.
http://www.clemson.edu/extension/hgic/hot_topics/2010/07glyphosate.html

Here is a link that might be useful: effects of glyphosate on tomato

First of all, how do you post pictures here?

Second, the link 'effects of glyphosate on tomato' left above by jean001a has a picture of a glyphosphate effected tomato plant and it looks just like mine do.

To: dickiefickle, all my garden plants are planted in a garden, in the ground, except for a cucumber and a pepper.

One problem I had, which is why I'm having such a bad weed problem, is that when I first decided to plant this garden, my plan was to use the rear-tine tiller owned by my landlord to till all the soil in the garden area, then to till in some bulk combo soil. However, the tiller has both a seized transmission and engine, so its useless.

This meant that I had to plant the garden in what was currently a lawn area, with grass and weeds. So I planted the plants just like I would plant a shrub or perennial. I dug holes about 14"-16" in diameter, about 14" deep, then I mixed my soil up and filed these holes, then planted the plants in the holes. Before planting, I didnt spray Roundup on the garden area, because I figured my landlord would want it to be a lawn again in the future, after the garden was picked. But later, she agreed to allow me to spray it, but by that time the garden was 3 weeks old.

However, the grass and weeds are still growing, so I first just weed-wacked them, but as the veggies grew larger, I couldnt take the chance of weed wacking the veggies by accident. But there are too many to pull every few days, so i did what I would normally do in an ornamental bed.

I first pulled the weeds under the drip line of the veggie plants, then I carefully sprayed Roundup to the other weeds, with the wand very low to the ground, on a non-windy day.

Also to dickiefickle: As far as my soil being too moist, the holes I'm growing in are 14-16" deep, and we live on the East coast where we have a drought just about every summer, where it wont rain for weeks at a time. Most watering is done by hand, and I never water too much or too often. Usually every 3 days or so, unless it rains, so the soil is never too wet for very long.

However, I planted a Dahlia, a 40" variety called 'Contraste' back on about May 5. It already had a long stem growing out of the tuber, so once I planted it, it immediately was 3" above ground and started growing leaves at once. Then on about May 20, we had an extremely rare 7 day long rain spell, where it rained on and off every day, and was constantly overcast. It actually rained about 3-5 hours per day. One day after the rain ended, the sun came out and some plants were wilting a little initially due to the bright sun for the first time in 8 days, but then most plants perked back up, except for the one Dahlia. It continued to wilt for 8 more days, til I dug down to the tuber, and discovered that it had rotted from the bottom up and was slimy and easily crushed in my hands.

****Anyway, my most important question at this point is: Now that I've pruned the tomatoes back below the yellowing areas on top of main stem and laterals, will those tomatoes grow new stems from the area where pruned like most plants do(2 or more new stems), or will no new growth start where pruned, and only new lateral will grow from between the main stem and leaf branches? How do tomatoes normally react to their stems being pruned?

This is happening to me too, its my first year ever doing tomatoes. They're on a deck, with mostly sun. I'm moving them down to the lower yard once the weather smartens up. Rain and rain for a week. I've read lack of sun and warmth can do this too... could that be the problem? Too much water? Help! I don't want to kill my first crop!

Here is a link that might be useful: {{gwi:1340792}}

Round up or any weed killers are deadly to tomatoes.... just consider them tasty weeds next time ;)

But if it didn't completely kill them and you and your neighbors stopped trying to kill weeds with chemicals, they will grow new stems... from everywhere, they don't call those new stems suckers for nothing ;).

They will just be set back a few weeks, which can be a problem for people with a short growing season.

Wow, that's exactly what's happening to one of my tomato plants, too! They're up against the fence that separates my yard from my chem-using neighbors. Should I leave the affected areas alone, or should I prune them off? Is the plant a goner, or will it survive? None of the other three tomatoes seem to have been affected, including another growing in the same earthbox.

High North. For future reference, Laying down a couple layers of cardboard and holding it down with some rocks or something would have killed the grass and weeds in a chemical free way. In fact, many people use cardboard or newspapers as a water permiable weed block under normal mulching circumstances, not just for killing off a large area of lawn.