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Re: weedkiller round young trees

Subject: Re: weedkiller round young trees
From: alison parish
Date: Jun 08 2009 23:14:48
Grounds maintenance operatives, in my experience, tend to use propriety
herbicide mixtures often containing Glyphosate.
I investigated a case where a two year old native hedgerow mix around a farm
looked fine the previous summer. In the spring the plants (now 3 years old)
especially Rosaceae, when they came into leaf emerged with very narrow
distorted leaves, dieback etc looking just as if they had been sprayed with
an old fashioned hormal herbicide such as 2,4-D.
The hedgerow plants were in shelters and the base was sprayed with
Glyphosate on 3 occasions each summer with no ill effect noticed; the last
spraying in early autumn was done when the soil was very dry.
I did some research and found out that if the soil is very dry soil
microorganisms are inactive and thus any herbicide falling on bare ground is
not broken down. When the soil becomes moist again roots took up the
herbicide and transmitted through the plants resulting in the distortion to
the leaves and the dieback. This effect is apparantly not uncommon with
Glyphosate.
Instructions on labels frequently state that herbicides are not to be
applied in drought conditions!!!
In previous lives I have sprayed propriety non residual herbicide mixtures
containing Glyphosate around young and mature tree bases; I never noticed
problems.
I was trained but as this was in the days before disposable paper suits were
available we never sprayed when very hot or in drought conditions - it was
far too uncomfortable! 

Alison
----- Original Message -----
From: "Vowell Tony AMG/CTH" <TonyVowell@xxxxxxxx.gov.uk> 
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Sent: Monday, June 08, 2009 11:31 AM
Subject: RE: weedkiller round young trees


This bunch appear to be at the 'that's a tree' and 'that's a shrub' and
'that's a daffodil' stage of development :(

Tony Vowell

Swyddog Coed/ Trees Officer


-----Original Message-----
From: Andersonarb@xxxx.com [mailto:Andersonarb@xxxx.com]
Sent: 08 June 2009 11:10
To: UK Tree Care
Subject: Re: weedkiller round young trees


In a message dated 08/06/2009 10:41:32 GMT Standard Time,
elsteadbysea@xxxxxxxxxxx.com writes:

In my  many years experience I often found killing weed around trees made
no
difference they still bashed the bark!



Hear Hear!

Tony could conduct a simple test; get the list of species that might be
susceptible to whatever it is they're spraying and ask the Grounds' people
if
they know what the proscripted (is that a word? whatever) generae actually
are.  It's all well and good the guys knowing what the chemicals are and
that their  use is proscribed but not knowing what the trees are....
Especially
if the  product data sheet uses botanical names.....

A park in Sheffield has Turkey Oaks that have been sprayed around for
years, nearby trees that haven't been treated look healthier to me. But I
could
be imagining things, mind you I was surprised that none of my crew had
noticed  the widespread London Plane Anthracnose.

Whats wrong with a bit of long grass at the base of a mature tree  anyway?

Bill.



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