What is this?

[Hellmanns]

A market gardening friend called me to diagnosis this. I don't have a clue.

About 5% of his plants have this clorosis, they either have it or they don't, anyone with any idea's as to the cause?

[KarenO]

Looks like iron deficiency. I can't explain why only some of his plants are affected unless he used different soil mix for a few.
A dose of fertilizer with iron in it will help.
KarenO
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[KarenO]

may not be strictly a deficiency of iron but rather an uptake issue caused by too wet, high soil ph, excessive phosphous etc. google iron chlorosis

KarenO

[Hellmanns]

Originally Posted by KarenO

may not be strictly a deficiency of iron but rather an uptake issue caused by too wet, high soil ph, excessive phosphous etc. google iron chlorosis

KarenO

Thanks, Karen.
Same soil used on all, but only affects a few plants. My friend says it happens every year for the past 8 or so years. He says the affected leaves always die, but the plant recovers after being transplanted.

[dfollett]

Originally Posted by KarenO

may not be strictly a deficiency of iron but rather an uptake issue caused by too wet, high soil ph, excessive phosphous etc. google iron chlorosis

KarenO

I had a similar problem with only a few plants in a flat showing severe yellowing. Karen's list mentions what I have concluded was the cause of my problem - High soil ph.

I add Garden lime to the peat based container mix I use. I recently purchased a new bag of lime. It is very finely powdered rather than the pelletized lime I have used in the past. I add the lime to the mix of peat, bark and perlite then stir it to blend everything. I think the powdered lime adheres to the damp peat it touches first and doesn't blend evenly like the pelletized lime does. That leaves a small portion of the mix (that portion with the limey peat) very high in lime and the rest with no lime. That portion of the mix heavy in lime will be much higher ph than the no-lime mix.

I'm not positive that is the answer to my issue, but that is the conclusion I've come to. Does my conclusion make sense to you gardening pros? That is the only answer I've been able to come up with.

[Dutch]

Hi Hellmanns,
Looking at the lower right hand corner, it appears to be sunburn. If that is the case, it will grow out of it.
Dutch

[Hellmanns]

Originally Posted by Dutch

Hi Hellmanns,
Looking at the lower right hand corner, it appears to be sunburn. If that is the case, it will grow out of it.
Dutch

Thanks, Dutch. It definitely ain't sunburn. They are growing under florescent lights in a grow box.

[b54red]

Use an iron supplement and put it diluted in a spray bottle and apply to the leaves several times a day for a few days. This will usually correct the problem if done soon enough. I usually have some plants affected by this every year and transplanting doesn't always solve the problem. My soil has a fairly high ph so I keep a close eye for chlorisis every year and every time I see signs of it I spray the leaves with an iron supplement. Once the leaves go from pale green to yellow it is harder to correct and once they turn white it is usually too late for those leaves but if the iron supplement is added the new leaves that come out are frequently normal.

Bill

[Hellmanns]

Originally Posted by b54red

Use an iron supplement and put it diluted in a spray bottle and apply to the leaves several times a day for a few days. This will usually correct the problem if done soon enough. I usually have some plants affected by this every year and transplanting doesn't always solve the problem. My soil has a fairly high ph so I keep a close eye for chlorisis every year and every time I see signs of it I spray the leaves with an iron supplement. Once the leaves go from pale green to yellow it is harder to correct and once they turn white it is usually too late for those leaves but if the iron supplement is added the new leaves that come out are frequently normal.

Bill

Thanks, Bill! I'll pass all of the responses along.

[PureHarvest]

Zooming in on the photo, and looking at the plant on the right, you can see some mottling on the leaves. That one looks magnesium deficient.
I think the one on the left is a different pattern than on the right.
Overall, something is not getting into the plant, OR too much of something.
I would be curious to know about the TDS (total dissolved solids) and pH of his source water. To be more specific, what are the exact minerals/elements in his source water that make up his TDS?
I ask this, because it has been going on for many years, and I'm assuming his has made adjustments to soil and fert, and still getting the problem. That would lead me to think about the water he has.

[Hellmanns]

Originally Posted by Hellmanns

A market gardening friend called me to diagnosis this. I don't have a clue.

About 5% of his plants have this clorosis, they either have it or they don't, anyone with any idea's as to the cause?

A "fleshy", wet, leaf curling, swelling has now developed on affected plants. The growth feels just like a soft wet mushroom.. Systemic bacterial infection??

[PureHarvest]

Are they grown in a heated greenhouse? Is it vented inside? Maybe air quality damage if so?
Any updated pics?

[Hellmanns]

Originally Posted by PureHarvest

Are they grown in a heated greenhouse? Is it vented inside? Maybe air quality damage if so?
Any updated pics?

I try to get some pics later today.

[Hellmanns]

Here's a new picture. My friend has sent a plant to be diagnosed too.

[Worth1]

2 days and nothing where are the plague doctors??

Worth