Powdery Mildew? What should I do?

[Creeperpark]

Water management varies in many degrees from the amount given and the timing in which it is applied. A substrate can be watered with a trickle or a saturation as well as with discharge or without discharge. There is no "one way" to water every substrate because the porosity is different for different substrates. If someone adds perlite to a promix hp the mix will need water more often or even daily.

Any fungus left behind when using fungicides will become resist to any future sprays and that's why I don't use them. .

 

[midwestkid]

I had PM in October/November as the Temps were fluctuating between seasons.
I think it's most important to address the environment and prevent the conditions which allow the PM to bloom. For me that was high humidity at night and lack of proper air movement. (Wet stagnant air)
so I ordered the oscillating fans and a Big exhaust fan. Added the dehuey. Got them on the way.
Then I sprayed Dr.Zymes. just one application. And defoliated like a madman to increase air flow below the canopy.
Added in the air movers (squirell cage fans on the ground, oscillating wall mounts up top.) Bought an AC infinity exhaust fan. And moved my dehumidifier into that room (redundancy)
this all sounds like a lot of money and/or effort, but one healthy properly finished plant will pay for all of this.
haven't seen PM since and I likely never will again because I removed the conditions.

 

[Creeperpark]

No disrespect intended friends, I researched this subject more than once. Here are some photos of past research of plants given measured amounts of water. The three in the left photo all had mold somewhere on the plants from overwatering in the fade. I gave the plants "three" 1000 ml of pure water every 3 days in 5 gallon pots, from late veg to the end of flowering. All the plants are from the same growing cycle the only difference is I moved the 3 over-watered plants to a different location so they wouldn't infect the others. In the photo on right, I reduced the water to 1000 ml every other day and had zero molds. What time of the grow do people have the most problems with mold. Flowering time, and why because the plant doesn't need the same amount of water in the fade as it did in early flowering. .

 

[Creeperpark]

I was reading Creeperpark bitch in another thread about Purecrop1 about how expensive Purecrop1 is for what it is - but I have some left from a year ago. I am gonna mix up some and spray the remaining AGs, and see what it does. The remains of those plants have some white crap on the leaves, which I believe is from too much moisture. VPD too far to the left of optimum on the curve, screwing up trics, and making white crap.

So I am gonna spray and see. And fix the VPD. And make a fan/filter. Gotta get better at this.

All pure crop is, is dormant oil and the active ingredients are just water, soybean oil, and corn oil mixed. I have mixed and used dormant oil for years and it only costs me about $7.00 to make my own! I used it on fruit trees every Winter for years. Why would anyone pay over $100 dollars for a gallon of soybean and corn oil mixed with water when it's nothing? I'm for the little guy that works hard for his money and not for corporate greed that takes advantage of someone's lack of experience. You can call it bitching if you want

 

[flylowgethigh]

Hey, no disrespect from me Mr. Creeperpark. I didn't use the stuff, and I had it a year. Still learning what the oils can do. I did try the PC1 on the AG lower flowers that are finishing, and it does seem to be turning some of the white crud yellow, but not all. It looks like my tent environment needs more help than I have been giving it. The other thing I'm doing being too humid is screwing up my trics, so this environment needs fixed.

Rinsing the freshly cut buds after taking off the leaves is also in the cards.

 

[Loc Dog]

What did you finally use? I am looking at foggers for some new strains for pro-active mite and fungus treatments. I think some work by raising PH of plant surface.