Re: Iris Borers
- To: Multiple recipients of list <i*@rt66.com>
- Subject: Re: Iris Borers
- From: J* M* <m*@junction.net>
- Date: Sat, 31 Jan 1998 22:30:45 -0700 (MST)
Anner Whitehead wrote:
>Does this suggest that the systemic action is actually ineffective, that the
>chemical must be working only as a contact poison, which it is not
supposed to
>do? Or does it suggest the rhizome itself does not support the systemic? Or
>that the plant absorbs only enough toxicity to kill young larvae? Or are they
>maybe just being drowned in Cygon?
>
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Or can it be that the borers are developing resistance to Cygon? It seems
likely that they eventually will be in a position to ignore it but perhaps
not as quickly as those insects which have a shorter life cycle.
John Montgomery
monashee@junction.net
Vernon BC Zone 5
