Re: iris borer, Iris tectorum

 

Thank you for the map, Sean.  Could it be the borers are not happy with the hot summers and lack of long cold periods that are typical with the deep South?  Maybe lack of  humidity for the western states?  

Dell Perry
Seandel Iris Gardens 
800 Purcell Dr 
Plano, TX 75025 
972-816-3418 
seandelirises@yahoo.com


On Tuesday, March 10, 2020, 07:45:32 PM CDT, Sean Zera zera@umich.edu [iris-species] <iris-species@yahoogroups.com> wrote:


 

Here's a (very) rough map of the range of iris borer (Macronoctua onusta): https://bugguide.net/node/view/11123/data. It's based on user-submitted photos so not complete (obviously they occur in Michigan), but gives the general idea. The borer is a native species, with Iris versicolor and I. virginica (and I. hookeri?) as its natural hosts. Since it doesn't occur in the Deep South even though suitable native iris hosts do, there must be some other reason that it's a northern species.

Sean Z

On Tue, Mar 10! , 2020 at 4:52 PM Shaub Dunkley s*@bellsouth.net [iris-species] <i*@yahoogroups.com> wrote:
 

I've heard that too and also interested about the line. TBS grow with less enthusiasm as you go deeper in the hot & humid Southeast. At some point people stop growing them at all, such as Florida and coastal areas along the gulf. Less TBS might explain a failure of borers to establish range?

Shaub Dunkley, Z7a NC mountains

On 3/10/2020 11:45 AM, D Perry-Seandel Iris Gardens s*@yahoo.com [iris-species] wrote:
 
Is there a North/South line also?  It seems  the people who have them are not in the deep South or Southwest.

Dell Perry
Seandel Iris Gardens 
800 Purcell Dr 
Plano, TX 75025 
972-816-3418 
s*@yahoo.com


On Tuesday, March 10, 2020, 10:04:45 AM CDT, gary white i*@yahoo.com [iris-species] i*@yahoogroups.com wrote:


 
The iris borer does indeed exist west of the Mississippi River.  It is also found west of the Missouri River.  I am in Lincoln, Nebraska (southeast Nebraska) and the borer is very  much alive and thriving here.  It does disappear west of us in central Nebraska.  It does not exist in western Nebraska, and does not get to the Rockies.  The Mississippi forms the border between Illinois and Iowa, and Nebraska is a few hundred miles west of the Mississippi.  

Gary White


On Monday, March 9, 2020, 05:56:09 PM CDT, Betty G b*@cybermesa.com [iris-species] i*@yahoogroups.com wrote:


 

Can tbose of you who responded to this post, please indicate where in the US you are growing irises?  I have heard that iris borers do not exist west of the Mississippi.  Can any of you let me know if it has crossed the Mississippi?

Betty


On 3/7/2020 5:33 PM, dkramb d*@badbear.com [iris-species] wrote:
 

Does anyone know if Iris tectorum is susceptible to iris borer? And if
so, like to what degree compared to beardeds?

Thanks,

Dennis in Cincinnati


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