Brown spots on leaves

Hi guys. Two plants, Frisian Dew and Bluehell, have gone from 24 hours light inside to 11.5 hours light outside about two weeks ago. I assume the plants have started flowering since that day. About a week ago we had a hot tropical wind force 6 from the Sahara desert containing a lot of dust.

Someone said it is a fungus, someone said too much feed, I think the old leaves are just dying.
The plants only had 1ml. of powerzyme per litre nothing else and were put in fresh soil when they went outside.

Can anybody give an answer according to the pictures?

Much appreciation.

im goin to say nuten burn.... thats the only thing it looks like to me unless you let a nutrient deficiency go to long an thats killing them

Only powerzyme and that on half the max dose, the leaves havent even been close to dark green as I usually have them.

beats me...Bump

Okay, the brown spots have gone by turning the majority of leaves brown, the plants have started budding, that probably was it. apart from the PowerZyme I bought a P2O5 and K2O concentrate especially for flowering.