RE: hort. oil was: Powder mildew?
- To:
- Subject: RE: hort. oil was: Powder mildew?
- From: V* M*
- Date: Thu, 13 Apr 2000 22:31:20 +0100
- Importance: Normal
Many thanks, Marge, for your informative reply. I don't know of anything
like this in Britain - perhaps other British listers may be able to advise
me if we do have horticultural oil.
The only non toxic way I know of preventing/killing aphids is to use washing
up liquid diluted with water, but this is now illegal here due to (IMHO)
bureaucratic bumbling :-).
The use of cinnamon as a fungicide intrigues me - not heard of this one.
Will do a search on the milk/water one and will let you know if I find
anything else about it. Would much prefer the smell of cinnamon to sour
milk though :-).
It has been far too wet for me to go out and check my Spirea over the last
3 - 4 days, but when I last looked it still appeared to have mildew, which I
find unbelievable.
Valerie, South Yorkshire, England.
-----Original Message-----
From: owner-perennials@mallorn.com
[o*@mallorn.com]On Behalf Of Marge Talt
Sent: 13 April 2000 10:58
To: perennials@mallorn.com
Subject: Re: hort. oil was: Powder mildew?
Sorry it's taken me so long, Valerie...am very behind with mail...as
usual:-)
Horticultural oils are petroleum-based oils used to control insects,
mites,
and prevent some diseases. They work best on certain insects like
aphids, scale, woolly adelgids, etc. They are relatively non toxic
to most animals, including humans...wouldn't drink it, but I don't
worry particularly if I get some on my skin, tho' I will wash after
using it. They are strictly contact insecticides with NO residual
activity which means you have to get the spray on the critter for it
to have any effect.
Used to be called 'dormant oil' spray as the formulation was much
heavier and could cause damage to actively growing plants. Today's
'superfine' horticultural oils are formulated for use on actively
growing plants. Best to always follow the instructions and read up
on what plants you should not use these oils on. They can remove the
bloom from blue-leafed plants, causing them to become green.
Haven't heard of using milk but have heard of using cinnamon as a
fungicide.
Marge Talt, zone 7 Maryland
mtalt@clark.net
Editor: Gardening in Shade
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