Help with diagnosis? (lots of pics)

[FillerBunny]

Hello all!
I have a Vanilla Kush about a week away from harvest.
I have been using biobizz all-mix soil, and biobizz nutes (grow, bloom, topmax and bioheaven)

Up until the week 8 of flowering, I had no problems at all.
Then on one occasion during week 8, I stepped the bloom and topmax nutes up from 4ml/l to 5ml/l, but this time also forgot to add the bioheven!!!
The next day i saw small signs of nute burn, (didn't flush though) so the next watering I used a very light nute solution (1 ml/l) and added 2ml/l of bio heaven (thinking it would need it after not having it last time)

I am now about 1 week away from harvest, and should really start to use pure water. Will this be ok or would i be starving the poor thing? (of something)

It looks like it could be a combination of heat burn, nute burn, and phosphorous deficency. (but what do I know!)

Can anyone take an educated guess as to the problem, and let me know what course of action to take to ensure a safe harvest?

Should I just go ahead with plain water, or do i need to correct this before it gets worse?

Many thanks for your help!

Here the photos:
(some with flash, some without!)

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[Exodus434]

Flush Do not add any nutes use distilled / Clean tap water for the last week keep a close eye on it Make sure you check the PH levels before flushing them make sure that your water PH is not to high or low and try to make sure the water is Room temperature so you do not shock the plant

hope this helps

 

[Serapis]

Raise your light.... That is classic heat stress/burn along with, as you stated, Phosphorous defficiency.

Forget about PHing your water, you are done feeding that plant via the roots. Straight up water will work. Allow the soil to dry a few days before whacking your plant(s).

 

[Jer La Mota]

It could be over fertilization, but more likely it is due to the pH being off. Too high or too low a pH can lock up nutrients in the form of undisolvable salts and compounds, some of which are actually toxic to the plants.

 

[FillerBunny]

Wow!
Thanks for the quick replies folks!
Straight up water it is then!
I just wanted to check its not likely to all go pear-shaped in the final week!

 

[cowboylogic]

Raise your light.... That is classic heat stress/burn along with, as you stated, Phosphorous defficiency.

Forget about PHing your water, you are done feeding that plant via the roots. Straight up water will work. Allow the soil to dry a few days before whacking your plant(s).

I agree, heat stressed and lockup, just let her finish.