Re: Re: borer at this time of year?

---

• To: i*@yahoogroups.com
• Subject: Re: [iris-species] Re: borer at this time of year?
• From: Dennis Kramb d*@badbear.com
• Date: Sun, 03 Sep 2006 11:24:27 -0400
• References: 20060903124846.8464.qmail@web88310.mail.re4.yahoo.com

At 08:48 AM 9/3/2006, you wrote:
>Even in Ottawa we see two separate flushes of borer activity.  I see 
>the first instar and fourth instar at the same time (early July).
>
>It makes them very difficult to control by non-chemical means.  I 
>can catch most of the first 'crop' in the leaves, but, due to the 
>subsequent growth of the iris, the second is much more problematic.
>
>Regards,
>
>Sandy Ives in Ottawa.


Hi Sandy,  My borer prevention involves cutting down the foliage in 
October... and although not 100% effective it certainly prevents 
major infestations.  This is the first time I've noticed borers in 
September though.

I feel pretty dumb, 'cuz I don't know what you mean by instar.  From 
the context, I'm guessing it has to do with life-cycle stages... such 
as borer caterpillars, and adult moths?

Anyway... I've had a few off-list responses confirming other people 
have 2 waves of borers.  Funny, though, that in 10 years of growing 
irises I never noticed it until now.

Dennis in Cincy



 
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