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[Rootsruler]

https://generalhydroponics.com/products/azamax/

[Bluey]

You appear to have spider mites

I've never had them so read below for a good run down.

https://www.growweedeasy.com/cannabis-plant-problems/how-to-get-rid-of-spider-mites

[Rwise]

in veg I use spinosad, in flower if I must I use 1 part ISO with 8 parts water, both are contact killers spray the under side first then the top the soil everydamnthing. Do this every third day for at least 3 treatments.

[Beano86]

How do I get rid of the bugs first time growing

[Rootsruler]

Cal deficiency usually shows up as crispier edges. I'm going to say N def. Could also be related to pH issues as mentioned by Bluey

[Bluey]

It's a calmag deficiency most commonly caused by too low pH in the medium.

[static]

Hi all, I grow in soil (black Swallow) one of my plants has developed this problem but others are unaffected, just curious if you have any idea what's going on? I am losing the big fan leaves because of this now

Thanks kindly

[Bluey]

A few small changes can bring it on more or earlier or both, such as brighter lights or a change in the VPD.

[Smallgrow]

Hopefully you’re right. Its defiantly happened before , but I think it’s more than just fall colours and the leaves dying off
Just trying to up my game as always

[Gingerbeard]

Actually, the leaves are turning off and the buds are soaking up all the nutes. Just keep with the bloom mix.
You've been growing for a while. This has never happened?

[Smallgrow]

Ya it’s a drag cause you know it’s taking away from the finish product so close to the end

[Smallgrow]

As a living soil grower I don’t really PH.
I do from time to time check the soil ph and it’s always 6.5-6,8 so pretty bang on
Yes calcium was a thought I’ve been adding more crab meal to my mix maybe I need more or a different source

[Bluey]

Agree with roots. Are you checking pH of inputs?

[Gingerbeard]

Mid-late stage flowering deficiency. Annoying but normal.

[Rootsruler]

Looks like some sort of deficiency. Calcium?