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Powdery Mildew and SoCal Fall Planting

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Re: Powdery Mildew and SoCal Fall Planting

Post  No_Such_Reality on 10/5/2017, 10:15 am

@sanderson wrote:I read a few articles and it seems that they are divided between composting affected plants and discarding them. thinking

Sorry for the late reply, I'm just getting back on my feet from a three week stint of cold>flu>bronchitis and too many horse pills to remember. I knew there was a reason I hate taking my kid to the pediatric urgent care.

Interesting article from Cornell.  https://grapesandwine.cals.cornell.edu/newsletters/appellation-cornell/2013-newsletters/issue-15/grapes-101

So I'd guess it depends on if you're hot composting or not and how diligent you are about pruning the infection and keeping it from reaching maturity and creating the spores that will relaunch when the weather warm. 

I compost mine and I figure it doesn't matter as during PM season in SoCal you literally can drive down the street and see trees and people's roses covered in it.

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Re: Powdery Mildew and SoCal Fall Planting

Post  sanderson on 10/5/2017, 3:43 pm

NSR, I'm sorry you have been sick for so long. I also caught a cold that developed into bronchitis and was stuck indoors for 2 weeks until the antibiotics kicked in.

I'm at least 3 weeks late on the seedlings. They are maybe 2" tall now but no 2nd leaves. Embarassed Today's chore is to pull down all the nasty cucumber, cantaloupe and winter squash vines.


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squash, cucumbers, powdery mildew

Post  countrynaturals on 3/18/2018, 12:34 pm

@Turan wrote:Squash are heavy feeders, so that is given as a reason to move their location.  But the main reason given for rotation with squash and cucumbers is powdery mildew.  That over winters in the soil.  It spreads easily, so I don't know how much help rotation is in a small garden space. Definitely don't put infected leaves in the compost though.  Your trellis growing is probably the best preventative anyways.

I copied this from an unrelated post, since it is such important info.  thanks Turan.
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Re: Powdery Mildew and SoCal Fall Planting

Post  countrynaturals on 3/25/2018, 11:56 am

I'm wondering if regular blowing with a fan or leaf-blower could prevent powdery mildew. Any thoughts?
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Re: Powdery Mildew and SoCal Fall Planting

Post  sanderson on 3/25/2018, 1:08 pm

Someone from a windy area might be able to answer that.

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Re: Powdery Mildew and SoCal Fall Planting

Post  DorothyG on 3/26/2018, 1:28 am

@countrynaturals wrote:I'm wondering if regular blowing with a fan or leaf-blower could prevent powdery mildew. Any thoughts?
 CN, we aren't the windiest area but we do get our share.  I thought of the fan idea several years ago but it wasn't practical for us so didn't try it.  

We had a lilac bush about 6 foot from the road edge that caught all kinds of breeze from the road and that didn't make a difference.  I don't like to use chemicals but when I do I try to find one that is more natural.  

The only thing I had any luck with was a liquid copper fungicide and I can say it did work great.  Way better than I expected.  The first year I used it my entire garden was infected.  I sprayed everything by hand and prayed.  I could see an improvement by the next day.  The tomatoes were sprayed 4 times that year but the rest of the garden only needed one more spraying.  The next year I did not have anything infected.
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Re: Powdery Mildew and SoCal Fall Planting

Post  sanderson on 3/26/2018, 3:10 am

Thank you for your input, Dorothy.

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Re: Powdery Mildew and SoCal Fall Planting

Post  countrynaturals on 3/26/2018, 12:15 pm

@DorothyG wrote:
@countrynaturals wrote:I'm wondering if regular blowing with a fan or leaf-blower could prevent powdery mildew. Any thoughts?
 CN, we aren't the windiest area but we do get our share.  I thought of the fan idea several years ago but it wasn't practical for us so didn't try it.  

We had a lilac bush about 6 foot from the road edge that caught all kinds of breeze from the road and that didn't make a difference.  I don't like to use chemicals but when I do I try to find one that is more natural.  

The only thing I had any luck with was a liquid copper fungicide and I can say it did work great.  Way better than I expected.  The first year I used it my entire garden was infected.  I sprayed everything by hand and prayed.  I could see an improvement by the next day.  The tomatoes were sprayed 4 times that year but the rest of the garden only needed one more spraying.  The next year I did not have anything infected.
Thanks, Dorothy. I saved that product info.
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Re: Powdery Mildew and SoCal Fall Planting

Post  No_Such_Reality on 3/28/2018, 11:02 pm

We have regular winds so that makes no difference and helps spread with the right weather.




UC Davis has awesome information on it.

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Re: Powdery Mildew and SoCal Fall Planting

Post  sanderson on 3/30/2018, 3:17 am

@No_Such_Reality wrote:We have regular winds so that makes no difference and helps spread with the right weather.




UC Davis has awesome information on it.
Yes, it does.

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Re: Powdery Mildew and SoCal Fall Planting

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