Re: Iris Borers

The nematodes parisitize the grubs while they are in the soil, so
     timing is important.  Once they've entered an iris rhizome, I doubt
     the nematodes can get at them.  In zone 5, a fall application would
     probably also work, but the nematodes are not winter-hardy here and
     our freezes are VERY 
   ***

Stephanie Markham's discussion of iriborers contains the above information --

Question--

the borer isn't in the soil very long -- I wonder if its only a matter of
hours before it pupates and metamorphacizes to hatch!!  (this machine is 
 slow so I hope you can get my drift here!!


 As far aas I know, and can understand, the borer is never really a grub, like the J. Beetle?????  It doesn't have a food source in the soil?????


Anyone understand this part of the life cycle of the borer??  

If it is not a grub, as the J. Beetle, and it's food source is the rhizome
while in larvae stage, one would have to use a systemic on the rhizome, or food source, to attack the borer.  nematodes wouldl not have a chance to attack
the borer??????  


Carolyn Schaffner in Buffalo, NY
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