TOMATO HELP...yellowing leaves spreading fast

Briefly...I have 4 raised beds planted with assorted veggies. I use an drip irrigation system so all beds receive the same water amounts. I interplanted this year- wanted to try planting different things together instead of all of one kind in one bed mostly because of past insect problems. One of my tomato plants began developing yellow leaves a couple of weeks ago. I googled pictures of the leaves and found conflicting info - too much or too little water, different mineral issues, but I couldn't find an exact match of any photos to my leaves. I gave up until now...the yellow leaves are on several plants in different beds. It has rained a lot so I turned off my irrigation system. I've added some Sulfate of Potash Magnesia and a little alfalfa meal thinking they may help. I've also sprayed with neem oil in case it was fungal. Unfortunately things have gotten worse! I noticed that some leaves have green veins and yellow around them while others are purely yellow. The green veins are new - it started with purely yellow leaves with no brown spots. I'm posting photos - anyone know what the problem might be? If not for saving the plants this year, I want to know and understand how to prevent/help correct the problem going forward. Thanks in advance!!

Someone told me there were about 22 viruses that could attack tomatoes. Have you been continually growing in the raised beds without crop rotation? If it's one of these viruses or another I doubt it's stoppable. While I can't say for sure that it is actually a virus, definitely rotate your crops next season.

I've not been a fan of constant drip irrigation. A friend who has it seems to fight mineral build up in the soil because the water doesn't ever flood through. The soil is constantly damp from the dripping water. Also it never is dry. I suspect that the problems the friend had with literally every crop and variety was from the drip system plus tired soil in the raised beds.

This year they bought all new topsoil and composted the worn material. They report success (and are still using the drip system). This is in California BTW.

So no direct help but merely some suggestions and ideas from others' experiences.

ps: my dad and grandpa used to dust their tomatoes with sulfur dust. It could be purchased in the 70s at drug counters much as we purchase Epsom salt now.

They would put it into something like a flour sifter and sift it lightly over the entire plant. It smelled like a box of matches! Maybe this would help?

Yellowing leaves is too much water. If you are getting rain, dont do the drip. Sulfur dust is usually for bugs... tomatoes need to dry out occasionally. There is a really awesome place to learn about tomato problems at 'Tomato Dirt' an online place. www.tomatodirt.com they are also on pinterest by the way

This message was edited Aug 10, 2017 12:39 AM

There is another thing, if you have determinate tomatoes ( they get 6'and no taller) they may be at the end of their days... but yellow is water. Shorter days.