powdery mildew and high ph?

[crabboyjimmy]

I hot the dreaded pm and im at week 6 of bloom. I hit it with a 3% peroxide solution which beats it back, but my crystals seemed to disappear? My next move is to hit it with my high strength fogger that I use for spraying for mites and thrips. I was going to load it with water with a ph of 8.5 or higher. Has anyone ever tried this or had problems w crystal formation while fighting pm?

 

[Dready_jake]

I believe you gotta get it up to like 10ph to be effective but I've never actually done it.

 

[crabboyjimmy]

Ive got about 90 plants in the room and its to late in the game tou burn sulpher. I was thinking of puttibg some sulpher powder in water and trying. But at this stage of the game and with this nsny plants i dont want to get to experimental

 

[GratefulOne]

The PM is already in the plants and just now blooming. You are not going to get rid of it in this batch. Give up and get clean. Keep better environment next run.

 

[Dready_jake]

Look into post harvest washing and do what the guy above said

 

[Granger2]

Your tap won't have high enough pH. You can use a wetting agent and wettable Sulfur, agitating constantly. But this will fuck with your buds and taste except in the first 2 weeks of bloom.

I would use Actinovate. Spraying every 14 days should keep it unnoticible for the duration. Non toxic to smoke. Use a penetrating spray for buds. Make sure you get fresh product. Check date. If you're going to order it, groworganic.com/peacefulvalley should have fresh.

What's the RH in your room? Plenty of air flow all around? Good luck. -granger

 

[crabboyjimmy]

Ive got 4 oscillating fans and 4 box fans plus an 8" hurricane pulling through my carbon filter and cooling my hoods. I've got my dehumidifier set on 55% and temps stay around 72F The 3% H2O2 did a great job of clearing the surface PM. It just seems to affect the trichs and sparkle on the leaves. Id love to dump the whole thing, but Im almost at the end of week 7, so one more week and Ill start to flush. Even If I end up having to blow it all into oil, Id still like to finish the cycle. The Pm wasnt that bad and I caught it early on, couple of fan leaves here and there and on the sugar leaves up close to the bud. Im just trying to push it back as much as I can before I harvest, Hence My original post. Will A high PH water solution mess up my plants or my trichs? Ive got some Purple Chem and some Chemfire Id really love to see make it. Ive got a fogger liker this I use for spraying for mites , and My plan was to use a heavy ph water to fog the plants with. hopefully heavy enough to knock down the pm, but light enough to not cause mold or bud rot. This stage in the game I dont want to get expermental. I just want to do what I can to preserve the trich and crystal structure

 

[crabboyjimmy]

And Ive got some PH up I use in my cloners or a little vinegar would get it up as well. plus a PH meter to ensure the % I was aiming for

 

[Dready_jake]

So a couple notes since you got it. It is systemic so hopefully only your flower group got it and they didn't but chances are typically slim. Chances are if you got pm it came from a clone or something and its everywhere at this point but if you get fresh genetics (seeds are your best bet to not get it again) and a deep nuke style cleaning. Then its really important you get that airflow up even more. Each leaf needs to be moving at pretty much all times. And if you're successful at getting that airflow up and inside of plants then you can actually run an even higher humidity. Stagnant air is a problem. humidity not so. guys who utilize this chart and dial in the environment can get 3 grams p'er watt on good genetics. Without mold.

 

[crabboyjimmy]

whats the # IN THE MIDDLE WHERE THE TEMP AND RH INTERSECT?

 

[mack 10]

That's where you want
To be.

What you want is the Clean light.
Wave bye bye to PM.

 

[crabboyjimmy]

The high PH water at 10.5 does an amazing job of knocking out the surface PM. I know it doesnt cure it, but by staying on top of it I can keep it from getting out of control til I harvest in a week. I decided not to use my electric fogger and just went with a spray bottle, works great

 

[Granger2]

Good to know about pH 10.5 water. BTW, vinegar will lower the pH, not raise it. Good luck. -granger