Re: Merit/Cygon (was CULT: Anne-Lise)

Chris-

I will field a reply to this from the heart of borer country.

Cygon is systemic, absorbed into the plant tissue. It stays there for about
two weeks. I assume the plant breaks it down and it needs to be reapplied.
Merit is longer lasting, but in my opinion is not as effective as Cygon. We
have
tried Merit (imidacloprid) for two seasons. We have applied as directed. In
the first year is was not as effective, so we doubled the recommended dosage
and still had borers. Since Merit is supposed to last for 6 months, we
applied
it well before temps were warm enough to trigger fan growth or borer egg
hatching. Areas treated with Cygon had far fewer borers than those treated
with Merit. I still hear much praise for Merit, and it is safer than Cygon,
but the
jury in my court remains in deliberation.

John Bruce
Hidden Acres Iris Gardens

----- Original Message ----- 
From: "Christopher Darlington" <chris.darlington@sympatico.ca>
To: <iris@hort.net>
Sent: Tuesday, August 17, 2004 8:38 PM
Subject: Re: [iris] Merit/Cygon (was CULT: Anne-Lise)


> Hi Char,
>
> Thanks for the information.  I wonder when Merit will become available
> up here ?
>
> BTW, does anybody know if Cygon 2E works the way Merit does ?  I read
> that Merit gets absorbed through the plants root system and makes the
> plant toxic to eat.  Does Cygon 2E work this way as well or is it used
> to treat the exterior of the fans and ground only ?  I have found that
> anything that I spray fans with, it never really appears to stick.
> Should I add soap to the solution ?
>
> Chris
>
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