Yellowing leaves (forum)

andrew660 starts with ...
Hi All.

First forum user here, so excuse me if this question has been answered before. I have attached images of five fruit trees from Daleys I planted about three months ago (the Tahitian Lime has been in longer). Not sure if the images names are visible on this forum, but there is a Dwarf Meyer Lemon, Dwarf Rio Red Grapefruit, Honey Murcott Mandarin, Tahitian Lime and a Black Sapote. The soil is approx 7.5 ph and when planted I mixed blood and bone, dynamic lifter and Searles 5in1 into the existing soil. Some trees seem to have a yellowing in patches between the veins and others, esp the grapefruit and mandarin seem to have a yellowing of the mid leaf vein. Any help or suggestions would be most appreciated. Thanks.
Pictures - Click to enlarge

Picture: 1
Picture: 2
Picture: 3
Picture: 4
Picture: 5

Time: 20th August 2013 5:44pm

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About the Author andrew660
brookfield
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andrew660 says...
oh, and also the grapefruit and the mandarin have leaves that are curling. The grapefruit is curling down, the mandarin is cupping up. Hope that helps identify the problem. Thanks in advance.

Time: 20th August 2013 5:50pm

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Julie says...
Two things come to mind.

1. I don't know where Brookfield is, but if your winters are fairly cold, citrus won't take up nitrogen till the weather is a little warmer. This is known as 'winter yellows'.

2. Possible mineral deficiency. Google
http://www.dpi.nsw.gov.au/agriculture/horticulture/citrus to check. Go to orchard management. Pictures will give you a fair idea of what may be wrong.

Time: 20th August 2013 7:51pm

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About the Author Julie
Roleystone WA
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andrew660 says...
Hi Julie. Thanks for that. Brookfield is in Brisbane, so pretty mild winters here. I will check out the DPI link.

Time: 20th August 2013 8:35pm

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About the Author andrew660
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Brain says...
I agree with Julie point 2. I think you have some mineral deficiency. If your Ph is 7.5, that's probably a bit on the high side for citrus as well.

If you haven't fertilise in the last few months, then I think a small (yes small!) doze of citrus fertiliser could help. It won't fix the existing leaves but will help promote a new healthy flush of new growth in the coming spring. And when this happens, then you know your plant is back to the optimal growth conditions.

Time: 21st August 2013 9:52am

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About the Author Brain
Brisbane
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Mike says...
Mmmmmm...yellow vein chlorosis,1 and 5 and the others show mineral deficiencies that could be inetrpreted more than one way.There is some winter cool/girdling going on that restricts nitrogen and something else as well.Toxicity from over application is just as likely as any other cause.

Time: 22nd August 2013 7:45am

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andrew660 says...
Thanks all, I will wait until it warms up a touch and see if anything improves on it's own. I did do a foliar spray of Epsom Salts for what I thought might be a magnesium shortage. I did wonder about a lack of potassium too........with the leaf curl. What do you think? Mike, what is 'yellow vein chlorosis'? If toxicity from the initial soil preparation is a possibility, then perhaps I leave everything alone for a while.
Cheers.

Time: 22nd August 2013 6:56pm

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brookfield
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Mike says...
Andrew yellow vein chlorosis is now low nitrogen can manifest in cold weather.P and K deficiencies are not seen in foliage much. Salt toxicity, Mg, Fe and Zn deficiencies of caused by antagonism or wrong pH can look like that.Check and adjust the pH, a little B&B or Dyn. Lifter and micro spray/water wouldn't hurt and depending on soil Epsom salts or dolomite in small amounts.Was lots of P and K or chloride containing fertiliser applied before winter?

Time: 22nd August 2013 7:40pm

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