Re: RE: Zone 6a and borer control

In a message dated 2/1/2005 6:36:18 PM Eastern Standard Time, 
mgreenfield@cinci.rr.com writes:
I soaked some TB's in a 25% solution over night by mistake. The borers were 
still alive the next day. I left them in the bucket for two more days and 
they were still alive. I killed them then, they might have died later 
anyway. 


Hi Mike,

What we use to kill borers in rhizomes, especially beardless, is two or three 
drops of Lindane in a bucket of water.  Lindane is a contact pesticide which 
used to be recommended for spraying irises, but it only killed those borers 
that chewed on the leaves and it washed off when it rained.  A half hour or so 
in the solution should kill any borers in the rhizomes.  We have never tried to 
kill borer eggs themselves, but have been using Merit or Marathon (same 
active ingredient) with some success.  The trouble is we have too many irises to 
keep up with.

Dorothy Willott

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