Anyone good at diagnosing plant problems?!

[Jimoffy]

ey guys I’m having trouble with my plant outdoors. Grown in coco in a 100Litre pot. New growth last Sunday all of a sudden turned yellow and brown, curling and canoeing up, turning crusty and dying off. It’s happening to most of the new growth, worse in some places than others. It’s a very big plant it has been vegging for 6 months now outdoors. Was originally a reveg

Now that flowering is meant to start in a week or 2 this problem has started. It isn’t too hot, as my other plants next to it are fine, just not as big as this one. The bottom growth, and new shoots under the net are perfect and not damaged.

I use an Australian fertiliser Called powerfeed plant food, for tomatoes and vegetables.

 

[Rox]

What's the NPK of the fertilizer you're using?

Initially I thought it was nute burn but I have had magnesium deficiency like that in the past

100litre pot of Coco will take a lot of water to flush with fresh nutrients!

 

[PDX Dopesmoker]

Do you have hemp russet mites down under?

 

[Jimoffy]

What's the NPK of the fertilizer you're using?

Initially I thought it was nute burn but I have had magnesium deficiency like that in the past

100litre pot of Coco will take a lot of water to flush with fresh nutrients!

Wouldn’t I expect older growth to be affected first from a deficiency though? I mean the lower shoots and older growth are fine

 

[Mystic Funk]

Wouldn’t I expect older growth to be affected first from a deficiency though? I mean the lower shoots and older growth are fine

hey.
that's because its a immobile nutrient problem and not a mobile nutrient...

one of the big problems you have are the spider mites. these will stress the hell out your plants and they will show this by wilting, leaf curl and spots. they'll also get sick easily and grow a lot slower to protect themselves from pests
the second problem you have seems to be a ph problem or ph burn which can easily happen in coco if not done right. this will look like multiple deficiencies, like in your case...
if you can give us more info on your grow methods like feeding and how much, what your PH is, do you foliar feed? then i'm sure i can help you more but with the info given that's all i can go one for now.



peace!
-mystic