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Cult: Spathe borers

Hello Everybody,

Does anybody have problems with moth larvas that bore through the spathes and demolish the entire bloom ?  I'm having great difficulty controling these things and wonder what others do to put an end to the damage caused by these pests.  These little white borers are about 1/4 long and have two little black specks for eyes.   I treated lightly with Cygon 2E about three weeks ago but it was was either ineffective or not timely.  

These borers could cause me to abandon Irises forever if I can't learn how to control them.  Seeing flowers rot on the stalk and not open is VERY discouraging :-(

Any help would be greatly appreiciated.
North of Montreal

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