Re: Borer control (was CULT: Anne-Lise)

For what it is worth-- I burned a two year plot of iris this spring to get
rid of grass and weeds.  When I dug the iris recently I was pleasantly
surprised by two things:  1) the size of the rhizomes was huge compared to
past experience in Indiana, probably due to virgin soil and rain.  2) not
one borer was found in any (about 80 varieties) TB.  I did find a few
scattered in medians, but minimal for 800 cultivars.  In contrast, 70
varieties of TBs stored at a friend's garden for two years were absolutely
devastated by borers.  Whole clumps were gone and not one variety was
without damage.  Weed and debris control was not done in this garden.
Is this more evidence that good grooming is the most effective weapon
against borers or was I just lucky?

Chuck Bunnell
Lafayette, IN
Region 6
Zone 5a-5b

----- Original Message ----- 
From: "John Bruce" <jbruce1@cinci.rr.com>
To: <iris@hort.net>
Sent: Wednesday, August 18, 2004 8:23 AM
Subject: Re: [iris] Merit/Cygon (was CULT: Anne-Lise)


| Well....maybe it is overkill. Or, you could choose to look at it
| like "supplemental" insurance :).  My observations of borers the last few
| years leave me wondering if we are seeing pesticide resistance in the
| critters.
|
| John Bruce
| Hidden Acres Iris Gardens
|
| ----- Original Message ----- 
| From: "Char Holte" <cholte@wi.rr.com>
| To: <iris@hort.net>
| Sent: Wednesday, August 18, 2004 9:00 AM
| Subject: Re: [iris] Merit/Cygon (was CULT: Anne-Lise)
|
|
| > Hi,
| >
| > My understanding they are both systemic.  Just different chemicals.
| > Overkill perhaps?
| >
| > Char
| > ----- Original Message ----- 
| > From: "Patrick Orr" <irisdude@msn.com>
| > To: <iris@hort.net>
| > Sent: Tuesday, August 17, 2004 9:55 PM
| > Subject: Re: [iris] Merit/Cygon (was CULT: Anne-Lise)
| >
| >
| > > why couldn't you use both?
| > >
| > >   ----- Original Message -----
| > >   From: Christopher Darlington<c*@sympatico.ca>
| > >   To: iris@hort.net<i*@hort.net>
| > >   Sent: Tuesday, August 17, 2004 6:29 PM
| > >   Subject: Re: [iris] Merit/Cygon (was CULT: Anne-Lise)
| > >
| > >
| > >   John,
| > >
| > >   Thanks you kindly for your response.  Seems to me that Cygon is the
| > >   route for me to follow, expecially for my first  attempts to deal
with
| > >   these pests.
| > >
| > >   I'd also love to see it effective against the smaller borers that
eat
| > >   into the spathes and destroy the flower before it has a chance to
| open.
| > >
| > >   Regards
| > >   Chris
| > >   Lafontaine, Quebec, 4b
| > >
| > >   John Bruce wrote:
| > >   >
| > >   > 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<c*@sympatico.ca>>
| > >   > To: <iris@hort.net<i*@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
| > >   > >
| > >   >
| > > ---------------------------------------------------------------------
| > >   > > To sign-off this list, send email to
| > > majordomo@hort.net<m*@hort.net> with the
| > >   > > message text UNSUBSCRIBE IRIS
| > >   >
| > >
|   > ---------------------------------------------------------------------
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| > >   > message text UNSUBSCRIBE IRIS
| > >
| >
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