Re: hort. oil was: Powder mildew?
- To:
- Subject: Re: hort. oil was: Powder mildew?
- From: M* T*
- Date: Thu, 13 Apr 2000 05:57:53 -0400
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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> From: Valerie-Anne Mullett <valerie-anne@lineone.net>
> Date: Saturday, April 01, 2000 11:26 AM
>
> Hi Marge,
>
> Can you tell me what horticultural oil is please?
>
> Also, has anyone heard of milk being used as a fungicide for
protection
> against mildew? In a gardening magazine last year I read that a
Wagner
> Bettiol at the enviornmental laboratory of Embrapa, the Brazilian
> Agricultural Reasearch Corpn had sprayed fresh milk, diluted with
water, on
> courgette plants and had found it as good as using chemical
controls.
>
> I noticed last week that I have mildew on Spirea 'Gold Flame' -
I've never
> had it on that plant before, nor have I seen mildew so early in the
year.
> What would the cause be this early, or have I just been lucky in
earlier
> years?
>
> Valerie, South Yorkshire, England.
>
>
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