Citrus Leaf Deficiency (manganese?) (forum)

Jaraed starts with ...
Hello this has been an issue for a while but I would like to get on top of it now that the warmer seasons are coming. I suspect that this is a manganese deficiency whether the soil is lacking or the plant simply can't uptake it.

The yellowing as you can see is only on the last flush and the previous leaves seem to be unchanged. A foliar application of NPK+ trace elements fert doesn't seem to have affected the yellow leaves.

Manganese defficiency is made worse by cold and wet conditions so I think this would at least improve as it gets warmer. It's a potted mandarin and I tested the pH and its on the lower side (6-6.5).

What could I do? Given what I have stated, would a foliar application of zinc+manganese help?
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Time: 3rd September 2020 10:25am

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David01 says...
Hi Jaraed,

It depends on the root stock and the varieties. For example I have 5 different Mandarine plants. Only Imperial and Emperor their leaves are evergreen even in winter, however, other 3 CVs most of their leaves turn into yellow during the cold months regardless what treatment provided. You need to wait until few more months thing will improve. Cheers

Time: 5th September 2020 11:48am

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Jaraed says...
Thanks David that eases my worries somewhat that you are saying you have some that go yellow regardless.

My mandarin is an emperor by the way. I'm not sure on the rootstock but I don't think it's a dwarfing stock. I would also guess that the cold hits potted trees a bit worse due to less insulation, perhaps I could provide some solution to that in the form of a "blanket" around the pot.

Anyway thanks for your insight. If the situation doesn't improve, I'll proceed accordingly.

Time: 5th September 2020 1:48pm

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David01 says...
Hi Jaraed,

Yes you are correct. The YOUNG plant grow in the POT is more susceptible to cold weather than the one grow in the ground. It also helps if the pot under the cover in winter. Everything will be back to normal in Spring. Cheers

Time: 8th September 2020 9:31am

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