General Discussion forum: Borers

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Views: 26, Replies: 4 » Jump to the end
Jul 15, 2013 9:11 AM CST
Name: Mary Ann
Just have a question about borers. I haven't dealt with them for over twenty-five years -- and then only one time -- so I'm not knowledgeable.

Yesterday when I was digging some rhizomes to ship out, I found several nice-sized rhizome increases attached to a large rhizomes that was rotting. I dug the whole thing up and in examining the large rhizomes, found a small white worm in the middle of the mush. Small equals about a third of an inch.

From recollection, when I saw borers that one time -- they were quite large (like a caterpillar) and pink. Disgusting. So I'm wondering -- is this tiny white worm a baby borer? Any ideas?
Every day is a second chance. Every day is precious time.
Jul 15, 2013 9:23 AM CST
Name: Arlyn
Whiteside Co, Illinois Zone 5A
i'd say that it is probably NOT an iris borer. More than likely a "fly" larva ,of some kind. The iris borers, when small ,are white, but as they chew their way down the leaf, they get larger, pretty fast. Any I've seen that were actually in the rhizome were nearly an 1" long, or longer, and had started to show a "pink" color . If the "fan' on that rhizome showed no evidence of "chewing", that would be another indicator of some kind of maggot, attracted to the rotting rhizome. My spent rhizomes generally dry up ,instead of rot, but with all the rain you've been getting, rot would be pretty likely. That said, I think I'd give a close check to others in that area, just in case.....Arlyn
Jul 15, 2013 9:54 AM CST
Name: Jerry
Salem, IL
The rotting which you described is probably the bloomed out mother rhizome. I have had them dry and shrivel but also rot if the ground is wet. Give the new babies a good bleach/water bath as a precaution.
Jul 15, 2013 11:00 PM CST
Name: Dee Stewart
Willamette Valley OR
Snowpeak Iris
also drench the soil really well with 80 to 20 bleach water

Denise Stewart

Jul 16, 2013 6:09 AM CST
Name: Mary Ann
OK -- thanks everyone. Jerry it definitely was a bloomed-out mother rhizome. And you're right -- ordinarily they just die away. With all the rain we've had this year, I've found rot in several rhizomes. Makes me mad....................... Grumbling
Every day is a second chance. Every day is precious time.

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