iris borer moth- undercovers?


 How do iris borers first get into a brand new garden of iris rhizomes 
if they never "even attempt to fly?" Are we to believe that moths 
crawl from *wherever* to a new iris bed?  We live about 8 miles from 
the nearest garden of any kind [really hermits] and yet tomato 
hornworms and cabbage loopers found our first veggie garden in 15 
years. 
 I think these guys must be flying around eating lots of other stuff 
just hoping someone might plant an iris.     Knowing alternative food 
sources might help us eliminate the borer by eliminating the "   "   
sources.  Am I onto something here?
 Virginia    middle Georgia zone 7/8
  
"... and remember that the moths emerge from the ground up, which 
would trap them under the cloth, with the irises.  If the moths reach
new egglaying sites by crawling (I've never seen one even attempt to fly),
the cover would be ineffective. Bill Shear Department of Biology
email<bills@hsc.edu> "



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