Please help diagnose

Hi All,



A problem with a White Widow again. Please see the pic.

I have read the stickies and all the guides, but still can't diagnose it myself - too many things match, yet not perfectly.

4 weeks in flowering.

The leaves affected - close to top, but not the very top. Serrated edges and tip burnt and there is yellowing between veins.

Noticed a week ago. Flushed, then after 4 days fed with 1/2 nutes. Didn't help. The problem seems to be spreading slowly.

Nutes are all organic BioCanna on their official schedule. No other additives.



Thanks

mgorsky

What kind of soil are you using. Looks like nute burn to me.

ProMix BX.