Hi guys today I have noticed that at the base of my precious girls theres leafs dropping off at a fast rate

they have like a burnt appearance to them?, almost as if its a nutrient burn or a PH in-balance.Ok I'm 3rd week in bloom I'm feeding 1 Day 2mls grow, and 1ml bloom Bio Bizz, another day 1ml, BAC Bloom, and 1ml PK,now thats my feed out of the way.Also I noticed some fruit fly so I decided to spray some all in 1 bug spray from DOFF it contains Pyrethrins I wonder if its this that has burnt the leafs and has caused it to drop off I dunno heres some pics of the leafs that dropped of minutes ago?, it says it can be used on Vegetables fruits, roses, any Flowers I took pics of the leafs that dropped off.

You will have to take a good look I gave her some Epsom salts just to be safe I dunno could it be the Magnesium ?.