Tomato plants going yellow & dying

This is my first year with a new poly-tunnel.

I planted loads of tomato seeds (from the same packet) into trays and when they'd grown large enough I transplanted them into small pots inside the poly-tunnel.

When they were large and healthy enough I planted 11 of the tomato plants inside the poly-tunnel and the rest of them outside in a small plot of their own.

The bed inside the poly-tunnel where I planted the tomatoes had a few large bags of compost (bought from a supermarket) dug in to help the soil.

At the same time as planting the tomatoes I also planted sweet peppers between the tomato plants.

The tomato plants outside are doing just fine but 9 of the 11 plants inside the ploy-tunnel have gone yellow and died and the other two are just hanging on a bit longer

The sweet peppers are doing just fine with no problems.

I don't understand what is happening and no one else on our allotments seem to know either.

Maybe you can shed some light on why the tomato plants in the ploy-tunnel have all but died whereas the ones outside are thriving?

Surely if it was something in the soil the sweet peppers would have suffered as well?



  • ItalophileItalophile Posts: 1,647

    Odd that the peppers are coping but the toms aren't. They're twins in terms of growing requirements. When you say they've gone yellow, have there been spots on the leaves? Has the yellowing been gradual or rapid? If the peppers weren't coping I'd be wondering whether the toms are getting sufficient ventilation, overheating perhaps.

  • Too much food maybe your acid went up and the toms cant cope but the peepers are able to withstand the high feed dosage? Tomatoes I have been reading since starting to grow them can react badly to high amounts of feed and it stops them taking up calcium as it blocks the root system so they become deficient wither and die.  I'm not diagnosing this as I have no photo and I'm only a novice but it rings a few bells with what I was reading a few months ago. This could be the problem ? Too much feed with low calcium levels in the soil? Have the soil tested at the garden center take a sample from the spot one died in

  • LynLyn Posts: 8,416

    Some of the leaves started going yellow on my tomato plants, so instead of chucking nutrients at them, I had a study and found the tiniest greenflies on the backs of the leaves, I rubbed them off and no more trouble, always check for pests first.

    There is an article about too much feeding of tomatoes in a mag this week. I expect you have all read it.

    Gardening on the wild, windy west side of Dartmoor. 
  • richard49richard49 Posts: 9

    I'll go back later today and have a look at the ones I pulled out to see if there's any obvious spots or insects.

    I've been feeding the tomato plants with tomato feed only once a week.

  • WelshonionWelshonion Posts: 3,115

    Did you delay feeding until the plants had visible small tomatoes or did you start feeding as soon as you planted them?

  • richard49richard49 Posts: 9

    The tomatoes inside the poly-tunnel were watered with tomato feed only the once and they were about 30 cm tall by then.

    The tomatoes outside were treated in exactly the same way and they're doing just fine and they're from the same seed.

    I've just phoned my wife who is at the allotment poly-tunnel now and she says that the few tomato plants left inside have what looks like small grains of white salt on the stems; probably some kind of mite/insect.

    I'd love to know what they could be and how to treat it.

  • They may have not died outside as it has been raining constantly and the feed got washed away? There may have been a large amount of feed in the compost 

  • DovefromaboveDovefromabove Central Norfolk UKPosts: 43,789
    No-one knows if you've done your housework, but everyone knows if you've done your gardening !
  • ItalophileItalophile Posts: 1,647

    Could be onto something, Dov.

    Christopher, the peppers are okay in the same soil so it can't be a soil problem. 

  • LynLyn Posts: 8,416

    As I said, more likely a pest of some sort.

    They dont need feeding until you see tomatoes on them, 

    Gardening on the wild, windy west side of Dartmoor. 
Sign In or Register to comment.