Return to the Integrated Pest Management Forum | Post a Follow-Up

 o
iris borers

Posted by bcubed 6TN (My Page) on
Fri, Mar 21, 08 at 19:41

I have never seen one, but I believe that my iris are infected with iris borers.The iris have brown spots on the leaves, and some rhizomes are rotten; there are places on the leaves which show the outline of some kind of caterpillar.

I googled iris borers and found the Bayer site, which has a grub control for lawns. This grub control has the chemical in it that I need to kill the iris borers. Does anyone know if that is what is messing up my iris, from what I have said?
If so, do I use the Bayer stuff? I cannot bear to kill these plants--they are my favorites. They are planted on a site that is well-drained, with clayey type soil; in full sun.

Any help you can give me would be much appreciated! BBBunn


Follow-Up Postings:

 o
RE: iris borers

If you had Iris borers you would find the grub in the rhizome around the soft, "rotten" parts. If you have them the best time for control is shortly after you see the signs of the larva tunneling down the leaves into the rhizome. Dig them up, cut off the soft, eaten, areas of the rhizome, feed the wee buggers to the birds. Dusting the soil and leaves with a pyrethrine based dust may help some, depending on where the larva come from. Many people wil tell you to clean up all debris in and around the bed to eliminate potential overwintering sites for the parent, but that also eliminates hiding places for any potential beneficial insects that could aid in control.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Integrated Pest Management Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here