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Discolouration of leaves

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Connie
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Terpinolene
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Hi guys,

These plants were moved outdoors recently, 2 of them are showing strange discolouration on the leaves.

At first I thought it was a pH issue as the soil was reading around 8.5. I amended with vinegar until the pH was 6.5. It has now been two weeks and no improvement. Picture number 2 is taken from today.

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200L base soil mix
60L perlite
5.6kg plagron worm casting
5kg plagron bat guano
Γ· 5 = 1 pot

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Connie
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Terpinolene
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Both are Holland's hope, I live in the Netherlands so the temperature outside is ranging from 15C during the day to 5C at night. I realise this is far too cold but I had no choice in moving them outside

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Macky
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It looks like you maybe have a bug problem mate, signs of thrips there. Also, that whiteness looks like powdery mildew, does it wipe off or has they leaf lost colour?Β 

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Connie
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Terpinolene
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@macky it's doesn't wipe off and it seems to be just loss of colour. I have also sprayed them with neem oil because I also thought it might be thrips but to no avail.

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Macky
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ah this will be down to the neem oil solution being too strong i think. Sray the plant just water to try and wash off any excess neem oil. What neem did you use?

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Connie
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Terpinolene
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@macky I don't think it is the problem because I sprayed them after the problem had started. I'm not sure on the brand but I used one teaspoon in 6L water

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Connie
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Terpinolene
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Also the discolourations are all on the middle leaves which makes me think it's a nutrient/ pH issue

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Valencene
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Looks like an Iron deficiency causing leaf chlorosis, new growth bright yellow, older growth brown & crispy at edges...

Is likely caused by bad Ph (as this will block Iron uptake) and maybe over watering...also vinegar is not a good Ph down, its only really a temporary fix as it breaks down in water

What is your base soil ?

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Connie
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Terpinolene
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@zn thanks for the info man, my base soil is this removed link

It says "RHP certified coconut,Β mixtures of European peat blocks and Canadian peat with longer fibers."
What should I use as a pH down?
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Connie
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Terpinolene
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"Jiffy lightmix 50L"

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Valencene
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@connie anything phosphoric acid based will be ok...I dont use any as my soil regulates it for me but I am guessing the light mix doesnt contain any/much lime...you can do a 6.5 PH'd flush (3xpot volume) and see if that helps...it will help remove the remains of the vinegar if nothing else...

Then feed 1/2 strength nutes on the next one

Β 

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Connie
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Terpinolene
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@zn hi everyone just a quick update, the problem seems to have cleared up, I presume the soil microbial activity has kicked in.Β 

I now have a new issue, with holes appearing on the fan leaves in specific patterns. This is currently affecting all plants to some degree.

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Β 

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Macky
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@connie caterpillars usually makes marks like these, have a good check under the leaves for little bugs. It is to be expected outdoors though, and its not a big infestation yet, but itll be good to find the culprit and remove it if it is still on the plant Smile

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