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Dennis told me he personally tried Assail for
curculio and it's not effective. So apparently Michigan and the
Universities participating in the Midwest Guide have it wrong.
I doubt a new product like Assail would
build up resistant populations that rapidly. Guthion was developed in the
60s, and just in the last decade has developed some insect resistance.
Mark
KS
----- Original Message -----
Sent: Thursday, February 12, 2009 11:49
AM
Subject: Re: [NAFEX] systemic pesticides,
Assail vs Imidan
My
take on that information is simply this: As more people use a particular
pesticide in an area there is an inevitable increase in the size of resistant
populations. Therfore it makes perfect sense that the same chemical would be
more effective on one region than another.
From: Mark Angermayer <hangermayer@isp.com>
To: dmnorton@royaloakfarmorchard.com;
North American Fruit Explorers <nafex@lists.ibiblio.org>
Sent: Wednesday, February 11, 2009
11:26:14 AM
Subject: Re:
[NAFEX] systemic pesticides, Assail vs Imidan
Dennis,
Alan and I have been discussing Assail's
effectiveness on PC and seem to be getting conflicting information from
various sources. As you point out NY say's it's not very effective
against PC. However, my most current Michigan guide (2007) lists Assail
as excellent control for PC. The 2009 Midwest spray guide lists Assail
as good control for PC. Can you comment on these discrepancies?
Have you tried curculio control with Assail?
Thanks,
Mark
-----
Original Message -----
From: Dennis
Norton
Sent:
Wednesday, February 11, 2009 10:00 AM
Subject:
Re: [NAFEX] systemic pesticides, Assail vs Imidan
Alan,
I have used Assail for about 5 years as one
of the 3 products i use in rotation. I do not use any organophosphates
such as Imidan any longer. I phased out Imidan over a 3 year period
and am now using Assail, Rimon, Avaunt and Calypso. Assail has very
little effect on PC, but Calypso seems to work quite well and much less
toxic than Imidan. If Assail REI and PHI are followed, you are
at less risk using Assail than you are
breathing the air in your own home or barn where hay is stored where molds
are more toxic.
-----
Original Message -----
From:
Alan Haigh
Sent:
Wednesday, February 11, 2009 6:10 AM
Subject:
[NAFEX] systemic pesticides, Assail vs Imidan
The issue of synthetic residues is always a potent topic of
contraversy so I'll definitely bite. I like a systemic pesticide
because it stays put. If you spray a tree with Imidan and walk
around under it while the chemical is still active and there is dew on the
ground your feet will pick it up. You will likely track it into your
vehicle or home where biological processes are greatly reduced and the
poison stays active for a very long time. I'm guessing the Assail
will mostly stay on the grass (and more importantly the fruit). If
you thin fruit by hand you are less likely to pick it up there as
well.
By the time you eat the fruit, 2 to 5 months will have passed.
The tiny little marble sprayed will be anywhere from the size of a plum to
a large peach or apple. Even 14 days after spray, the poison will
have inadequate strength to kill the targeted organism whose entire diet
is that fruit. I will experience much more exposure in the mixing
and spraying process so a tiny fraction of residue doesn't concern me
much. I'm much more concerned about oncoming traffic on my way home
from the orchard.
I'm nervous about using Assail only because I haven't used it before,
and Imidan is a tested and trusted ally against PC. I guess none of
you have used it yet.
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