VASCM: Resistance management strategy

[Ed Muns]

I start the season with Stylet Oil and Kaligreen and then alternate through
4-5 different synthetic classes for the rest of the year.  No fungicide
class is used more than twice to minimize resistance build-up.  I never
spray the same material successively and try to maximize the spray cycles
between the same material.  Perhaps overly conservative, but this is serious
business for the serious grape grower.

As far as I know Stylet Oil doesn't build up a resistance so much as the
issue being that it must be used every 7-10 days and most people aren't that
diligent.  The interval for any fungicide depends on the temperature and
attendant disease pressure, so intervals can be slightly varied on this
basis.  But, in my experience, you can seldom get away with longer intervals
than the label recommendation ... and, that assumes your spray equipment and
canopy management allows adequate application to all parts of the vine.

Regards,
Ed
------------------------------------------------------------------
Ed Muns
Muns Vineyard - www.munsvineyard.com
Facebook - www.facebook.com/munsvineyard

 

> -----Original Message-----
> From: vascm-bounces at kkn.net [mailto:vascm-bounces at kkn.net] On 
> Behalf Of Jim Varano
> Sent: Monday, May 27, 2013 4:58 PM
> To: vascm at kkn.net
> Subject: VASCM: Resistance management strategy
> 
> Dear Members, I have been a bad boy and haven't sprayed as 
> much as I should have in the Past 4 years as my small 
> vineyard was getting established . Now it seems I have a very 
> bad case of Powdery Mildew that is reeking havoc on some of my vines.
> I have started a spray schedule this year... I have done 2 
> sprays of Stylet Oil @ 1.5 %.
> 
> I was under the impression that you can spray 3 times with 
> one product then switch to another for 3 sprays then go back 
> to your original ..... But my memory fails me....
> 
> So......what do you folks do for a resistance management 
> strategy ? What products and time intervals?
> I plan on spraying this Thursday weather permitting...so I 
> have time to get what's needed.
> 
> Now I know if you ask 10 people you might get 10 
> answers...but there might be a common thread. And I know I 
> could hire an outside consultant...but I believe that this 
> forum and it's members expertise can help...If I totally 
> botch it,I can save my pennies to hire someone.
> 
> Thanks in advance for your help 
> 
> Novice
> Jimmi Varano
> Spider Mountain Vineyards
> Boulder Creek
> 
> Sent from my iPad
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