HELP! Strange yellowing from the inside out!

[Alexanderz]

Hi all! I have a problem with my flowering feminized white widows from RoyalQueen Seeds: the fan leaves are turning brown from the middle to outside near the buds. They are enduring high temperatures between 27c° and 28c° so I think they are stressed. I have flushed them but the problem persist.

I also have pulled a couple of nanners here and there.

My setup:

​​​​​soil 11 lts pot
Phlizon 600W led 45cms away
60x60x160 cms tent
Flowering stage week 9
Biobizz tripack: currently Top max and biobloom
Ph: between 6.3 to 6.6 in water and runoff
55w exaust and ducting

What do you guys think?

 

[billyboy]

Did you try the Plant Doctor: https://www.growweedeasy.com/cannabis-symptoms-pictures

 

[Alexanderz]

Yep it looks like Cal Mag deficiency, but I have no experience to confirm...

Maybe adding a kelp based nutrient will help, in case the problem is the heat stress?

 

[Canuck147]

Looks ugly - looks like the beginning of bud rot or mold - try and look inside one of your buds. Green is good, brown is rot.

 

[Alexanderz]

On my way! I will post pictures also.

 

[billyboy]

I think it looks like this: https://www.growweedeasy.com/cannabis-plant-problems/ph-fluctuations

 

[Alexanderz]

I think it looks like this: https://www.growweedeasy.com/cannabi...h-fluctuations

I though so at first, but the yellowing in my plants starts at the center of the leaf and then expands outside.

 

[Alexanderz]

Looks ugly - looks like the beginning of bud rot or mold - try and look inside one of your buds. Green is good, brown is rot.

The calixes of the buds looks fine. I have lots of browning pistils tho.