How friggin' dry does it have to be for indicas to NOT get powdery mildew, goshdarnit?

ltecato

ltecato

Well-Known Member
I'm in LA County, about 20 miles from ocean, and my damn indicas keep getting PM even though I spray them with mancozeb. For a while I was in Monterey County and another grower told me I should stick to sativas there because of the humidity. Well I can understand that because Monterey is practically in San Francisco, and it's overcast and cool even in the summer and foggy most nights, but LA County is a desert, and it seems to me that plants that can do well in Morocco or Lebanon ought to be OK here.

(John Belushi voice) But noooooooooooooooooo! Even after I spray with mancozeb, the suckers get the accursed white powder!

I am not happy! Dr. Feelgood autoflower and Godfather Purps seem to be the most prone.

I'm going to try using Serenade and also spraying the moldy parts daily with drugstore hydrogen peroxide. And I'm snipping off any fan leaves that have been infected.

But I'm wondering, would switching to sativas make any difference? Or hybrids, maybe?
 
Booger mama

Booger mama

Active Member
ltecato said:
I'm in LA County, about 20 miles from ocean, and my damn indicas keep getting PM even though I spray them with mancozeb. For a while I was in Monterey County and another grower told me I should stick to sativas there because of the humidity. Well I can understand that because Monterey is practically in San Francisco, and it's overcast and cool even in the summer and foggy most nights, but LA County is a desert, and it seems to me that plants that can do well in Morocco or Lebanon ought to be OK here.

(John Belushi voice) But noooooooooooooooooo! Even after I spray with mancozeb, the suckers get the accursed white powder!

I am not happy! Dr. Feelgood autoflower and Godfather Purps seem to be the most prone.

I'm going to try using Serenade and also spraying the moldy parts daily with drugstore hydrogen peroxide. And I'm snipping off any fan leaves that have been infected.

But I'm wondering, would switching to sativas make any difference? Or hybrids, maybe?
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I'm 2 miles off Oregon coast and last year my indicas all got powdery mildew. I'm growing all sativas this year. I haven't had powdery mildew at all. Last year I didn't use neem oil until I got powder mildew, this year I use neem oil on the top of the soil and underside of leaves almost every water. So I can't really say I'm doing better because I'm growing sativa for sure.
 
Rob Roy

Rob Roy

Well-Known Member
ltecato said:
I'm in LA County, about 20 miles from ocean, and my damn indicas keep getting PM even though I spray them with mancozeb. For a while I was in Monterey County and another grower told me I should stick to sativas there because of the humidity. Well I can understand that because Monterey is practically in San Francisco, and it's overcast and cool even in the summer and foggy most nights, but LA County is a desert, and it seems to me that plants that can do well in Morocco or Lebanon ought to be OK here.

(John Belushi voice) But noooooooooooooooooo! Even after I spray with mancozeb, the suckers get the accursed white powder!

I am not happy! Dr. Feelgood autoflower and Godfather Purps seem to be the most prone.

I'm going to try using Serenade and also spraying the moldy parts daily with drugstore hydrogen peroxide. And I'm snipping off any fan leaves that have been infected.

But I'm wondering, would switching to sativas make any difference? Or hybrids, maybe?
Click to expand...

I've had good success getting powdery mildew in veg to go away using liquified sulfur paste in a spray bottle. It also seems to make bugs very unhappy too.

Not sure if Espoma makes it anymore, but Bonide can be found most places that have garden supplies. Don't forget to add a little surfactant. Good luck.
 
ltecato

ltecato

Well-Known Member
Went out this morning and it appeared that misting the plants with hydrogen peroxide had done gotten rid of most of the PM. I sprayed what was still visible and I'll try to do that every day and hope that it will keep the PM under control.
 
JavaCo

JavaCo

Well-Known Member
ltecato said:
Went out this morning and it appeared that misting the plants with hydrogen peroxide had done gotten rid of most of the PM. I sprayed what was still visible and I'll try to do that every day and hope that it will keep the PM under control.
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If you have horsetails growing nearby also known as shave grass by you it is very good at keeping PM under control and completely free .You can also buy dry online by the pound. Just put some in a bucket and add water over the top let it sit in the shade for 2 weeks. Then mix @ a 1 to 9 ratio one part fermented horsetail tea to nine parts water and foliar spray with it. Really should be using this as a preventative it is also very high in silica, but like they say better late then never. Mines ready today made some a couple weeks ago going to spray tonight. Just be sure to spray either first light or sunset to avoid burning the plants. This site here has the recipe and more info https://www.nature-and-garden.com/gardening/fermented-horsetail-tea.html
 
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ltecato

ltecato

Well-Known Member
JavaCo said:
If you have horsetails growing nearby also known as shave grass by you it is very good at keeping PM under control and completely free .You can also buy dry online by the pound. Just put some in a bucket and add water over the top let it sit in the shade for 2 weeks. Then mix @ a 1 to 9 ratio one part fermented horsetail tea to nine parts water and foliar spray with it. Really should be using this as a preventative , but like they say better late then never. This site here has the recipe and more info https://www.nature-and-garden.com/gardening/fermented-horsetail-tea.html
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I have grown horsetails. They are cool plants in containers and really easy to grow, but you have to be careful with them in this area because they can be extremely invasive and hard to remove once they get established. Thanks for the recipe!
 
W

waterproof808

Well-Known Member
Regalia has drastically reduced PM and botrytis for me. A bit expensive though. Some strains are just prone to PM no matter what.
 
ltecato

ltecato

Well-Known Member
waterproof808 said:
Regalia has drastically reduced PM and botrytis for me. A bit expensive though. Some strains are just prone to PM no matter what.
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I saw where clone grower Mama Funk endorsed Regalia on her website, but as you said it is a bit pricey. I have opted to try Serenade as soon as I can get over my latest attack of laziness.

I mentioned that I blasted all the PM-affected plants with drugstore hydrogen peroxide. It seemed to knock the mildew back quite a bit, however after a day or so I noticed some of the leaves on the plants I sprayed are dried out and brown, so I am wondering if the peroxide might have burned them. I sprayed two days in a row, concentrating on the visible mildew.
 
FresnoFarmer

FresnoFarmer

Well-Known Member
ltecato said:
I saw where clone grower Mama Funk endorsed Regalia on her website, but as you said it is a bit pricey. I have opted to try Serenade as soon as I can get over my latest attack of laziness.

I mentioned that I blasted all the PM-affected plants with drugstore hydrogen peroxide. It seemed to knock the mildew back quite a bit, however after a day or so I noticed some of the leaves on the plants I sprayed are dried out and brown, so I am wondering if the peroxide might have burned them. I sprayed two days in a row, concentrating on the visible mildew.
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Did you spray in daylight?
 
ltecato

ltecato

Well-Known Member
FresnoFarmer said:
I always try to spray early morning when the sun is less intense and temperatures are a bit lower. I watered mid-day a few days ago and got some on the leaves. Spots where water hit em turned all brown and crispy..
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I can believe that would happen. The water or peroxide drops act like lenses, maybe.
 
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