Magnesium and Tomatoes

Latest Articles

Magnesium and Tomatoes

Downsizer Forum Index -> Grow Your Own

Author

Message

cab

Joined: 01 Nov 2004
Posts: 32429

Posted: Mon May 09, 05 8:51 am Post subject: Magnesium and Tomatoes

Had some yellowing to brown spots on the leaves of four of our tomato plants (in one big trough) over the weekend. First appeared in Friday, by this morning they looked fairly unhappy. The younger leaves looked happier, but kind of pale.

Classic symptoms of a magnesium deficiency. So I've taken the unusual step of giving them a liquid feed before they've set their first truss.

I've never seen this in tomato before. Any thoughts anyone?

tahir

Joined: 28 Oct 2004
Posts: 45434
Location: Essex

Posted: Mon May 09, 05 8:53 am Post subject:
https://www.downsizer.net/bookmarks/view/onecat/Root%20\|%20Grow%20Your%20Own%20\|%20Resources%20&%20Organisations/Tomato%20Problem%20Solver/*/

cab

Joined: 01 Nov 2004
Posts: 32429

Posted: Mon May 09, 05 9:00 am Post subject:
Thanks! Nice pictures. What's happening on these four plants looks a lot more like the magnesium deficiency picure on this page, only a lot less severe: https://www.luminet.net/~wenonah/min-def/tomatoes.htm Looks a lot more like a nutrient problem than a pathogen or a pest. Not something I've had in toms before.

tahir

Joined: 28 Oct 2004
Posts: 45434
Location: Essex

Posted: Mon May 09, 05 9:02 am Post subject:
Can't say I've ever had the problem so I'm no help.

joanne

Joined: 28 Oct 2004
Posts: 7100
Location: Morecambe, Lancashire

Posted: Mon May 09, 05 9:07 am Post subject:

Think I may be having the same problem with a few of my varieties - The Gardners Delight seem to be fine but a few of the italian types are looking very weedy - I thought this might be because they desperately need potting on but having seem the piccies of Mg defiency - think it is more likely to be that.

Shall give them a bit of a feed to perk them up tonight before some of them go down to my Dads.

Last year I feed them Comfrey but this year we haven't easy access to comfrey until the seeds I've just planted come up.

Joanne

joanne

Joined: 28 Oct 2004
Posts: 7100
Location: Morecambe, Lancashire

Posted: Mon May 09, 05 9:15 am Post subject:
Actually mine could also be a Nitrogen deficency - anyway a general feed should perk 'em up Joanne

Treacodactyl
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 25795
Location: Jumping on the bandwagon of opportunism

Posted: Mon May 09, 05 11:34 am Post subject:
Not looked at the links from work but could any of the damage be frost? We've had some cold nights recently. Could it also be sun burn if they've been put out in a greenhouse on a very sunny day?

cab

Joined: 01 Nov 2004
Posts: 32429

Posted: Mon May 09, 05 12:58 pm Post subject:
More likely wind damage; they're currently hardening off, and haven't been out at night yet. Not in a greenhouse either, and although we do get some wind where they've been standing out, nothing else seems to be suffering. So I'm blaming a nutrient deficiency; old leaves being affected first, and away from the veins, so that's likely to be magnesium.

Res

Joined: 07 Apr 2005
Posts: 1172
Location: Allotment Shed, Harlow

Posted: Mon May 09, 05 2:00 pm Post subject:
Thats a handy link anyway Tahir thanks, I have saved it in my fav's

sean
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 42207
Location: North Devon

Posted: Mon May 09, 05 2:46 pm Post subject:

Res wrote:

Thats a handy link anyway Tahir thanks, I have saved it in my fav's

Good that he made it nice and short so that you don't end up needing a 6' wide monitor too.

	Downsizer Forum Index -> Grow Your Own	All times are GMT
Page 1 of 1

View Latest Posts