Help with diagnosis - Possible fungal issue

Hi all,

First post, first grow... many lessons learned

Orange Sherbet Auto from FastBuds
Outdoor grow - 2.5 gal fabric
Mediterranean climate: ave temp 30° - ave humidity 70
Medium: Soil - crappy generic (one of my many mistakes)
Water PH @ approx 6.4 (noob error, first 3 weeks I PH balanced before adding nutes)
Nutes: Biobizz - Fishmix, Bio-bloom & Topmax.
Age: 6th week

Everything has been going ok aside from some early mistakes however, the last day i've noticed brown patches suddenly appear almost overnight after a feed. I've been feeding after every other water but I had to dial back the dosage to half recommended after getting a little nute burn. Aside from that, she's a little stunted but otherwise healthly and flowering like crazy.

I've been trying to work out if this is nute burn, a deficiency or rust fungus or other pest.

Thanks for any help you can give

OSBuds said:

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Many thanks

Your “ generic “ soil / medium probably is ph buffer deficient… you mentioned 6.4 from you … soil plants are in range if 6.5 - 7,0. When i use peat dominate mixes - i target 6.6-6.7 ( allows for ph drift ) .

Budzbuddha said:

Your “ generic “ soil / medium probably is ph buffer deficient… you mentioned 6.4 from you … soil plants are in range if 6.5 - 7,0. When i use peat dominate mixes - i target 6.6-6.7 ( allows for ph drift ) .

Click to expand...

Awesome. Many thanks for the advise. I'll correct moving forward.