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Yellow/dying leaves on tomato seedlings
+4
slimbolen99
TinySpock
Turan
CitizenKate
8 posters
Yellow/dying leaves on tomato seedlings
We came home from being gone most of the past week, and left our gardening in the care of our pet sitter. I have a couple dozen tomato seedlings I started around the end of March. They were doing great before we left, but upon return, I found several of them (multiple species/hybrids) with leaves that were yellowing, then dying, starting around the edges.



The leaves affected were the lowest one or two branches (above the seed leaves, which were all fine), and none of the top-most branches/leaves have been affected... yet.
I hope this was just due to being over-watered - I think that would be easy enough to remedy - but I'm also concerned there may be some kind of fungus spreading between the plants. I did see one plant with leaves that had this appearance last week, before our trip. For now, I'm just letting the pots dry out a bit, and watering as conservatively as possible for the next week or two. Today I cut off all the leaves affected by this symptom, hoping it goes no further, but standing by with anti-fungus measures in case it rears its ugly head again.
Has anyone here seen this before? Possible causes/remedies? Thanks for any experience/insight you can share.



The leaves affected were the lowest one or two branches (above the seed leaves, which were all fine), and none of the top-most branches/leaves have been affected... yet.
I hope this was just due to being over-watered - I think that would be easy enough to remedy - but I'm also concerned there may be some kind of fungus spreading between the plants. I did see one plant with leaves that had this appearance last week, before our trip. For now, I'm just letting the pots dry out a bit, and watering as conservatively as possible for the next week or two. Today I cut off all the leaves affected by this symptom, hoping it goes no further, but standing by with anti-fungus measures in case it rears its ugly head again.
Has anyone here seen this before? Possible causes/remedies? Thanks for any experience/insight you can share.
CitizenKate- Posts : 844
Join date : 2015-03-20
Location : Northeast KS, USA; Zone 6a
Re: Yellow/dying leaves on tomato seedlings
To my eye that looks like a nutrient deficiency. I would make it some well rounded liquid boost with trace minerals. Probably mixing some kelp with a dab of fish emulsion into water for them.
Take a look here ~ http://www.farmspeak.com/nutrient-deficiency.html
Take a look here ~ http://www.farmspeak.com/nutrient-deficiency.html
Turan-
Posts : 2603
Join date : 2012-03-29
Location : Gallatin Valley, Montana, Intermountain zone 4
Re: Yellow/dying leaves on tomato seedlings
Turan wrote:To my eye that looks like a nutrient deficiency. I would make it some well rounded liquid boost with trace minerals. Probably mixing some kelp with a dab of fish emulsion into water for them.
Take a look here ~ http://www.farmspeak.com/nutrient-deficiency.htm
Thanks, Turan!! That link is incredibly helpful!
TinySpock-
Posts : 81
Join date : 2015-03-16
Age : 71
Location : Kingman, Arizona
Re: Yellow/dying leaves on tomato seedlings
Second that! Thanks very much for sharing it.
CitizenKate- Posts : 844
Join date : 2015-03-20
Location : Northeast KS, USA; Zone 6a
Re: Yellow/dying leaves on tomato seedlings
Are you sure that the plants didn't get too close to the lights? Mine kind of burn off if they get within 1/2" or even touch the bulbs. Something to ponder.
slimbolen99- Posts : 185
Join date : 2013-01-15
Location : Shawnee, KS
Re: Yellow/dying leaves on tomato seedlings
+1 what Turan said. The chlorosis is a clear sign of nutrient deficiency. A shot of liquid fertilizer and there should be improvement in a week. If no improvement, it could be a pH issue.
43 years a gardener and going strong with SFG.
https://squarefoot.forumotion.com/t3574-the-end-of-july-7-weeks-until-frost
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Re: Yellow/dying leaves on tomato seedlings
Could be some of all of those things. I forgot to mention to my helpers that the lights needed to be adjusted when the plants get taller, and they did end up growing up into the lights while I was away. This also reminds me of one occasion when some tomato plants a neighbor was growing turned that yellow color right after a very heavy rain, and it was determined they experienced a temporary iron deficiency due to there being too much water in the mix, which was not draining very well. The problem cleared up within a day after it was discovered. The leaves just turned right back to their normal color after the growing mix dried out a bit.
In addition to drying them out a bit by setting them outdoors for a few hours a day, I added some liquid fertilizer to the water, and they're doing better now. They've all got lots of new growth, and they're starting to green up again.
In addition to drying them out a bit by setting them outdoors for a few hours a day, I added some liquid fertilizer to the water, and they're doing better now. They've all got lots of new growth, and they're starting to green up again.
CitizenKate- Posts : 844
Join date : 2015-03-20
Location : Northeast KS, USA; Zone 6a
Re: Yellow/dying leaves on tomato seedlings
Hi,CitizenKate wrote:Could be some of all of those things. I forgot to mention to my helpers that the lights needed to be adjusted when the plants get taller, and they did end up growing up into the lights while I was away. This also reminds me of one occasion when some tomato plants a neighbor was growing turned that yellow color right after a very heavy rain, and it was determined they experienced a temporary iron deficiency due to there being too much water in the mix, which was not draining very well. The problem cleared up within a day after it was discovered. The leaves just turned right back to their normal color after the growing mix dried out a bit.
In addition to drying them out a bit by setting them outdoors for a few hours a day, I added some liquid fertilizer to the water, and they're doing better now. They've all got lots of new growth, and they're starting to green up again.
What kind of liquid fertilizer did you use?
freedoms1791-
Posts : 20
Join date : 2014-10-15
Age : 67
Location : Zone: 5A Northern IL. Gurnee, IL.
Re: Yellow/dying leaves on tomato seedlings
Hi,CitizenKate wrote:Could be some of all of those things. I forgot to mention to my helpers that the lights needed to be adjusted when the plants get taller, and they did end up growing up into the lights while I was away. This also reminds me of one occasion when some tomato plants a neighbor was growing turned that yellow color right after a very heavy rain, and it was determined they experienced a temporary iron deficiency due to there being too much water in the mix, which was not draining very well. The problem cleared up within a day after it was discovered. The leaves just turned right back to their normal color after the growing mix dried out a bit.
In addition to drying them out a bit by setting them outdoors for a few hours a day, I added some liquid fertilizer to the water, and they're doing better now. They've all got lots of new growth, and they're starting to green up again.
What kind of liquid fertilizer did you use?
freedoms1791-
Posts : 20
Join date : 2014-10-15
Age : 67
Location : Zone: 5A Northern IL. Gurnee, IL.
Re: Yellow/dying leaves on tomato seedlings
I used this, with about half the recommended dosage.
Miracle Gro Liquafeed for Tomatoes and Veggies
Miracle Gro Liquafeed for Tomatoes and Veggies
CitizenKate- Posts : 844
Join date : 2015-03-20
Location : Northeast KS, USA; Zone 6a
Re: Yellow/dying leaves on tomato seedlings
CitizenKate wrote:I used this, with about half the recommended dosage.
Miracle Gro Liquafeed for Tomatoes and Veggies
Thanks
freedoms1791-
Posts : 20
Join date : 2014-10-15
Age : 67
Location : Zone: 5A Northern IL. Gurnee, IL.
Re: Yellow/dying leaves on tomato seedlings
Hi,CitizenKate wrote:I used this, with about half the recommended dosage.
Miracle Gro Liquafeed for Tomatoes and Veggies
Did you feed the Roots & Leaves and how much water to Liquafeed did you mix?
Thanks
freedoms1791-
Posts : 20
Join date : 2014-10-15
Age : 67
Location : Zone: 5A Northern IL. Gurnee, IL.
Re: Yellow/dying leaves on tomato seedlings
About 1/4 tsp. in a quart of water. I water the roots only.
CitizenKate- Posts : 844
Join date : 2015-03-20
Location : Northeast KS, USA; Zone 6a
Re: Yellow/dying leaves on tomato seedlings
CitizenKate wrote:About 1/4 tsp. in a quart of water. I water the roots only.
Thank you
freedoms1791-
Posts : 20
Join date : 2014-10-15
Age : 67
Location : Zone: 5A Northern IL. Gurnee, IL.
brianj555-
Posts : 444
Join date : 2017-08-22
Location : Zone 9 - Mississippi
Re: Yellow/dying leaves on tomato seedlings
Same variety?
Lower those lights until they are millimeter above the growing parts. Right down on ‘em
Lower those lights until they are millimeter above the growing parts. Right down on ‘em
Scorpio Rising-
Posts : 8373
Join date : 2015-06-12
Age : 61
Location : Ada, Ohio

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