[Community_garden] Rhubarb leaves

[Peter Hoang Nguyen]

Hi Catherine,
I am not familiar with rhubarb so I looked on the internet to see what they
are. There so many different species of rhubard. So I am wondering if you
can tell me the type of rhubarb that you are using to kill the aphids.

Thanks
Peter
----- Original Message -----
From: "Catherine Vandermeulen" <catherine.vandermeulen at gmail.com>
To: <community_garden at list.communitygarden.org>
Sent: Tuesday, September 25, 2007 5:04 PM
Subject: Re: [Community_garden] Rhubarb leaves


> Hi Garth,
>
> I made a tea with rhubarb leaves last summer to spray my tomato plants.
It
> killed the aphids.  My approach was experimental.  I boiled five rhubarb
> leaves in a small pot.  I let the mixture cool and then mixed it with
water
> 1for 2.  I used a spray bottle and applied the mixture twice. The mixture
> was a little bit too strong, but it killed the bugs!
>
> I hope this helps!
>
> Cheers,
>
> Catherine
>
>
>
> 2007/9/25, Mike McGrath <MikeMcG at ptd.net>:
> >
> > The leaves (but not the stalks) of rhubarb are toxic to mammals (i.e.,
> > us),
> > (see gov't copy below) but I've never heard of them being used against
> > insects.Garlic sprays have been shown to be insect repellant and neem
> > sprays
> > repellant and insecticidal to those what not be repelled.
> >    But go ahead and try the rhubarb; just don't drink any!
> >
> >                                            ---McG
> >
> > Rhubarb contains naturally occurring oxalic acid. The amount depends on
> > the
> > age of the plant, the season, the climate and the type of soil. Highest
> > concentrations are in the leaves and these should not be eaten.
> >
> > Oxalic acid poisoning can cause muscle twitching, cramps, decreased
> > breathing and heart action, vomiting, pain, headache, convulsions and
> > coma.
> >
> > ----- Original Message -----
> > From: "Garth Taylor" <gtaylor at mcic.org>
> > To: <community_garden at list.communitygarden.org>
> > Sent: Monday, September 24, 2007 4:15 PM
> > Subject: [Community_garden] Rhubarb leaves
> >
> >
> > >I read a little while ago that insect predators do not like the toxins
in
> > > rhubarb leaves.
> > >
> > > If that's true, then it ought to be possible to make a tea of rhubarb
> > > leaves
> > > and spray it on plants to get rid of insects.
> > >
> > > Has anyone ever heard of this? Any ideas on dosage?
> > >
> > > Thanks,
> > > =Garth Taylor
> > >
> > >
> > >
> > >
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