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A Gardeners Forum Forums Gardening Reference Gardening in 2006 Pyrethrin Question for Iris

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Pyrethrin Question for Iris #53516 March 22nd, 2006 at 12:14 PM
Joined: Apr 2003 Northern Illinois TheGardenerGuy OP Member
OP TheGardenerGuy Member Joined: Apr 2003 Northern Illinois	Has anyone used this on their iris to control the iris borers? We have a big problem with these pests where we live... I was wondering how well it worked and if the powder or spray is more effective. Greg

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Re: Pyrethrin Question for Iris #53517 March 23rd, 2006 at 03:48 AM
Joined: Jan 2004 PA Buglady Member
Buglady Member Joined: Jan 2004 PA	if you use a spray you need to use it when the adults are out and laying eggs. This is temperature dependant for your area. Once the borers are inside they pyrthrins are worthless.

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