From

Location

Message

Date Posted

NEPA [email protected] KB3QKV

Just like others, we have PM on our leaves. I do not like using fungicides but I used Immunox anyway but it did not rid the leaves of the PM. How many times should I use it before the PM is gone? How often should I use it? Thanks.

7/25/2005 8:32:55 AM

Menomonie, WI ([email protected])

PM is one of those things that once it is there. You have it you are now trying to prevent it from spreading to the other leaves.

7/25/2005 9:30:17 AM

Udine, Italy

Powdery mildew is very difficult to eradicate also using triazoles, I suggest you 2/3 treatments with a fungicide every 8/10 days; always mix the triazole with other fungicides effective against PM to prevent resistance. There are some natural products that are effective against powdery mildew (especially when used as preventive).
Potassium dihydrogen phosphate: http://www.epa.gov/pesticides/biopesticides/ingredients/factsheets/factsheet_076413.htm
Baking soda: http://attra.ncat.org/attra-pub/bakingsoda.html
AQ10 (Ampelomyces quisqualis) and ultrafine oils: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7406.html
Milk: http://www.thefrugallife.com/mildew.html

7/25/2005 9:32:24 AM

Key West, FL

you can't get rid of PM, only prevent it from spreading.

7/25/2005 9:33:07 AM

Key West, FL

dang, you guys were fast. I started doing something else and then posted and you guys had beat me to it.

7/25/2005 9:34:29 AM

No Place Special

Prevention is the best medicine. A little late now but a good leson learned. To those who dont have it yet you better spray now. Personally I like Eagle 20. I think it can be bought off Pumpkinsupply.com. Its a systemic.
MF

7/25/2005 10:04:54 AM

Western PA

If you only use one kind of fungicide like Immunox, the PM builds a defense against it. I have learned from the PGPGA that we must alternate different fungicides every 7 to 10 days while adding 2 tbs of Baking Soda per gallon of water to each.

As a prevention I use Immunox, then Neem Oil, then Fung-onil all with Baking soda every 10 days. I also want to add Stylet Oil to this so that it is 40 days past until I use the same one again. All of these products fight PM in different ways.

We must spray under the leaves also.

7/25/2005 11:21:24 AM

NEPA [email protected] KB3QKV

What does the baking soda do?

7/25/2005 7:51:38 PM

NEPA [email protected] KB3QKV

ermacora67 good reading. Thanks. Does anyone know why I have PM on my two pumpkin vines but none on the cucumbers even though the pumpkin vines run into the cucumbers?

7/25/2005 8:01:38 PM

San Jose [email protected]

I think someone said each type of plant has its own "brand" of PM

7/25/2005 8:08:32 PM

Ontario, Canada.

In 1998, Church & Dwight Co. the manufacturer of Arm & Hammer™ baking soda—received EPA registration for Armicarb 100®, a potassium bicarbonate formulation, for use against PM, downy mildew, botrytis, and alternaria leaf-spot...:0)

7/26/2005 1:58:16 AM