Pest Prophet for grape powdery mildew

Winemaking Talk - Winemaking Forum

Help Support Winemaking Talk - Winemaking Forum:

Snafflebit

Junior Member
Joined
Oct 9, 2013
Messages
372
Reaction score
303
Location
San Jose, California
I thought I would give a shout out for the Pest Prophet phone app, in case others are not aware of it.


Pest Prophet

I used to spray sulphur about once a week on the grape vines, which was more than necessary. Now I use this app to time my spraying, which follows the UC Davis grape powdery mildew growth model and many others for insects and fungal diseases, based on temp and humidity at a geolocation. The first model is free, which is all I need. But if you grow other crops and especially are trying to earn a profit, I suggest looking at this app.
 

srcorndog

srcorndog
WMT Supporter
Joined
May 14, 2012
Messages
170
Reaction score
39
Location
West Georgia USA.
In the southeast powdery mildew and downey mildew is a fact because of our wet region we live in. Spray every 7 day and some time more often next couple days we are forecasted for 3 plus inches of rain. Anything on the vines is washer off hope the Jap beetles get washed off! Will keep an open mind and take a look at the web site thanks
 

Neb Farmer

Member
Joined
Oct 4, 2019
Messages
49
Reaction score
83
Location
Southwest Washington
I'll be taking a look at this and probably try it out and see how it goes. My spraying sulphur is pretty basic, with the only real difficulty being finding the right time between heat waves or rains, but maybe this pest prophet will be worth the look. Thanks for sharing!
 

wood1954

Senior Member
WMT Supporter
Joined
Sep 1, 2011
Messages
589
Reaction score
326
Location
Northern wisconsin
I use newa.cornell.edu it probably provides the data for pestprophet and it’s free. I use it to time spray for grape berry moth otherwise I spray between rain storms.
 

srcorndog

srcorndog
WMT Supporter
Joined
May 14, 2012
Messages
170
Reaction score
39
Location
West Georgia USA.
Here is the deep south UGA has developed a pest management poster most of the vineyard owners have poster.
I have shared a link to this publication., our vineyard management poster, now available in both English (Viticulture Management | UGA Cooperative Extension) and Spanish (Manejo del Viñedo | UGA Cooperative Extension) languages, has a “scouting” comment in the “cultural practice” section during pre-harvest. There are several other disease and insects also worth scouting for throughout post-veraison that are also mentioned on this poster. This poster is a work in progress added to each year to fit each vineyard situation.
 

Snafflebit

Junior Member
Joined
Oct 9, 2013
Messages
372
Reaction score
303
Location
San Jose, California
Here is the deep south UGA has developed a pest management poster most of the vineyard owners have poster.
I have shared a link to this publication., our vineyard management poster, now available in both English (Viticulture Management | UGA Cooperative Extension) and Spanish (Manejo del Viñedo | UGA Cooperative Extension) languages, has a “scouting” comment in the “cultural practice” section during pre-harvest. There are several other disease and insects also worth scouting for throughout post-veraison that are also mentioned on this poster. This poster is a work in progress added to each year to fit each vineyard situation.
that is a very good poster! Thanks for sharing
 

dwhill40

Senior Member
Joined
Jan 15, 2013
Messages
238
Reaction score
68
Here in the rainy south the best predictor of black rot, anthracnose, downey mildew is when you wake up and the earth is still rotating the conditions are right (unless we are in a drought) I've watched and tested closely and the end result is preventative spray. Black rot and anthranose come early, powedery mildew is barely a thing, downey mildew will wipe out the vines later in the year. I spray copper twice a year one dormant and once at the beginning of hot weather, mancozeb twice early after bud break, a strobulirin twice, myclobutanil twice, captan and agriphos will wipe out downey mildew so I use it as needed. A month from harvest is use serenade. I have two blocks both are on hill tops in pasture away from any sources of infection. Under the vines are kept clean and I keep the clover, fescue, bermuda cover cut short.
 

Dennis Griffith

Supporting Members
WMT Supporter
Joined
Jun 16, 2018
Messages
720
Reaction score
585
Location
Hillsboro, Ohio
It's much the same here in the Ohio Valley region. Great conditions for fungi of all sorts. My wife even got histo several years back, but the doctor told me that mancozeb was out. And I was fueling the sprayer for a bombing run :h
 

srcorndog

srcorndog
WMT Supporter
Joined
May 14, 2012
Messages
170
Reaction score
39
Location
West Georgia USA.
Here in the rainy south the best predictor of black rot, anthracnose, downey mildew is when you wake up and the earth is still rotating the conditions are right (unless we are in a drought) I've watched and tested closely and the end result is preventative spray. Black rot and anthranose come early, powedery mildew is barely a thing, downey mildew will wipe out the vines later in the year. I spray copper twice a year one dormant and once at the beginning of hot weather, mancozeb twice early after bud break, a strobulirin twice, myclobutanil twice, captan and agriphos will wipe out downey mildew so I use it as needed. A month from harvest is use serenade. I have two blocks both are on hill tops in pasture away from any sources of infection. Under the vines are kept clean and I keep the clover, fescue, bermuda cover cut short

Do you have a local supplier for your chemicals or do you order. Chemical supplier web site if you could share. I use Keystone pest solutions always looking for a additional supplier. Thanks
 

dwhill40

Senior Member
Joined
Jan 15, 2013
Messages
238
Reaction score
68
A yearly small dose of imidacloprid in the drip irrigation when the shoots are 6 inches and I haven't seen PD since I began eight years ago.. I also grow vinifera on its own roots. I'm south of Huntsville so practically the same macro climate as yourself.
 

Dennis Griffith

Supporting Members
WMT Supporter
Joined
Jun 16, 2018
Messages
720
Reaction score
585
Location
Hillsboro, Ohio
I have an observation to share. Just walked back from a row planted last year and every vine shows no sign of fungus pressure. All other vines show some sign of downy, which is typical here. I've only sprayed these once this year (mixture of mancozeb, Zeta-Cypermethrin, and Serenade). The difference is I did a root soak using Actinovate last year prior to planting, and then a soil drench later in the season. This row consists of America, Buffalo, Norton, and Catawba vines, and all look good. I plan on continuing use of this product.
 
Top