Yes, this is an important part of the
preventative measures. It would definitely be good to remove any of these that
are in the soil of the bed you dug. Noting the location you live (upper New York
state) it is probable that the borers had not reached that stage of the life
cycle at the time of your dig. (a high percentage if not all would have been
still in the rhizomes)
... sift through the soil for any though just
in case. They would be shiny chesnut brown in color, approx 1/2 to 3/4
inches in length, pointed ends. Normally in undisturbed soil they would be found
in the first couple of inches but as you dug the bed they may now be deeper.
From: Mary Blatz
Sent: Saturday, July 31, 1999
Subject: [iris-talk] CULT: iris borer
OK I'm sure many of you are sick of this subject, but I was digging
around today out in the bed where I had such a bad infestation of borer (you
may recall my 4 garbage bag story) and I was wondering how I would identify
the borer pupae that may (probably are?) slumbering in the ground.
Specifically, how deep in the ground would they be and approximately how big
are they? Is it reasonable to be looking for them as a measure against
next year's infestation?
After what those ugly caterpillars did to my little darlings, I AM ON THE
Thanks in advance for your help--
Skaneateles, NY (near Syracuse) USDA Zone