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Re: RE: Zone 6a and borer control

Killing borer eggs is an interesting idea. When we have a major infestation
we try to kill them with fire in late fall or very early spring by burning
over the iris beds. The trouble with using bleach to kill borer eggs is
timing. Most bleaching occurs at dig time for replant or shipping. If the
rule of six weeks after bloom to six weeks before frost is followed, it is
extremely unlikely that borer eggs are present. Borer eggs hatch during the
first warm snap in spring, thus the recommendation to apply Cygon when
foliage has reached six inches in the spring. By dig time, borers are
usually either very fat and in the middle of a rhizome or have already
exited the rhizome to pupate. In this area, borer moths do not emerge until
well after shipping season is over. I have seen borers survive the bleach
dip and rinse because they are so deep in the rhizome. I have also seen fans
and rhizomes with little or no external evidence of borer damage, yet when
dividing the rhizome find a fat and healthy borer. That is why shippers here
in borer country have to examine plants to be shipped very carefully.

It is possible to ship borer eggs on spring or fall shipments of beardless

John Bruce
Hidden Acres Iris Gardens

----- Original Message ----- 
From: "Char Holte" <cholte@wi.rr.com>
To: <iris@hort.net>
Sent: Tuesday, February 01, 2005 5:08 PM
Subject: RE: [iris] RE: Zone 6a and borer control

> Hi,
> I just use the bleach as a cleaner and perhaps a killer of eggs.
> I don't think any grower would ship borers knowingly and I do check every
> rhizome I buy for problems.  Sometimes they are dirty and so the soak
> show a hole.  Also, they are still very small at my dig/plant time.
> Thanks for the kind words, Mike I appreciate them.
> Char New Berlin, WI

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