ahh i see, here's the problem you will have.. A plant that big that is already infected with pm will produce a very crappy moldy yield. Sulphur and all that crap won't do anything for you except make everything taste like shit and make a huge mess. I have extensive knowledge of pm lol..
Serenade will only help control but if it's a bad pm infection it won't do shit. Get a big garbage can from home depot and fill up 40 gallons or so.
eagle 20 is only 2 ml a gallon so add 80 ml and some dawn to
help get it everyhwere. then you can dunk all your large plants. Again just make sure you have a full on
Respirator and
FULL body protection.
Also i'm talking only plants in veg... Otherwise if you can't do this then just cut the plant down and start
with fresh plants you can dunk or that are healthy. Otherwise you will battle PM for the next 6 months and then you will use the
eagle 20 dunk. Also let the plant veg for at least another week prefereably 2 weeks before flowering if you should use the
eagle 20. good luck.