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Massillon, Ohio

Will a foliar spray of an oil, clog the pores and prevent absorption of future foliar sprays? I'm getting some powdery mildew in spite of using systemics,contacts & milk sprays. I'm thinking of trying an oil.
Thanks,.....Glenna

8/24/2007 9:53:44 PM

Rhode Island

kocide has copper in it and will definately help control powdery mildew
not sure if oil will clog the leaf pores. we neve ruse it
pap

8/24/2007 10:15:48 PM

Vancouver Washington

I use Neems oil as one part of a three part attack against powdery mildew.

I have sprayed it three times so far this season with a complete under and upper leaf drenching spray. It has not had any effect on any of the other foliar applications. I wouldn't spray it back to back on successive days, but the waxy look the leaves get dissapears within a few days and the leaves seem to actually like the stuff.

I rotate that with a milk spray - one cup per gallon - then a baking soda spray - 1 teaspoon per gallon. I have powdery mildew on my cucumbers, zucchini, adn squash plants, but not a bit on the pumpkins - which i believe is due to the more focused spray regime I just mentioned.

I heard the the best defense agains powdery mildew is to come come at it from lots of different angles and i don't like fungicides - due to the harshness.

8/25/2007 12:27:01 AM

[email protected]

If oil is applied at 1% (as directed) then it won't clog the leaf stomata. Oil alone acts to control Powdery Mildew but as a companion to Potassium bicarbonate, acts as a superior surfactant. There wouldn't be as much benefit from using it alone.

8/25/2007 6:24:30 AM

Jackson Twp, Ohio

Glenna, Its been tough, I am having to apply my sprays in more water then normal to guarantee that I hit all the leaf surfaces. The only places I've seen powdery mildew are in areas which I miss with my fogger or don't get adequate coverage.

Nick

8/25/2007 9:26:44 AM

Massillon, Ohio

Thanks guys,
I totally hate that stuff & was determined to beat it this year. Will try harder next year!!! I'll get after it with something this weekend - just have to decide what......Glenna

8/25/2007 9:42:00 AM

Rhode Island

fortunately nana powdery mildew is usually a very slow death and not as bad as having a soil born disease in your plant
pap

8/25/2007 2:40:59 PM