my huge maple trees are all covered in white stuff :-((( gotta do something about it!i think last year there was a discussion on it and several people were going to try baking soda, milk and neem oil i believe... what were the outcomes?
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Re: powdery mildew on my maples
Mon, July 7, 2008 - 1:59 AMi've had great success with neem oil... there's some sort of mixture you can make with powdered milk that i have heard works well..
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Re: powdery mildew on my maples
Mon, July 7, 2008 - 6:06 PMwow! That is a large plant to have powdery mildew, is that common for a maple to get PM? Is it a threat to the surrounding trees because PM spreads fast? How do you apply a Baking soda mix or Neem oil to a huge maple? Hearing of a huge Maple covered in Powdery Mildew makes me cringe, I hate the stuff. Good luck -
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Re: powdery mildew on my maples
Mon, July 7, 2008 - 7:54 PMi've only applied neem to large crops of smaller plants, never to trees.... i'd imagine you'll have to get a large resevoir type container (i.e. trash can) and fill it with water and neem oil.. then purchase a fairly strong sub pump and spray the trees with a hose.... in between treatments you can spray the trees with ph 7.0 water.... that makes the leaves less acidic which slows PM..
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Re: powdery mildew on my maples
Mon, July 7, 2008 - 8:57 PMHi,
Hydrogen peroxide (H2O2) works well. You can buy 30% solution from chemical supply houses to dilute and spray on. After it oxidises and loses its extra oxygen molecule, it is just water (H2O). I buy expired bottles for $50 for four gallons. I believe it is used in the manufacturing of circuit boards and other clean room stuff. I use it to clean my compost tea making equipment and to spray on fungal and bacterial pests. Dilute at 12/1. Maybe use a syphoning attachment on your hose. The kind for spraying fertilizer.
Good Luck.
