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Re: Is this iris nutrient deficient?
  • Subject: Re: Is this iris nutrient deficient?
  • From: Bill Chaney <billchaney@ymail.com>
  • Date: Sun, 8 Apr 2012 14:46:16 -0700 (PDT)



I am a retired entomologist, turned iris breeder, and I spent a 20 year career trying to find ways to control aphids. There are a number of biological controls that can be effective, but for any biological control to work, a population of aphids must be tolerated before the control works.  Ladybugs and green lacewings are your best bets for biological controls that can be purchased, but naturally occurring populations of beneficial insects are always best, but somewhat unreliable.

The good news is that there is an effective insecticide on the market that is much safer that disyston.  The product is imidacloprid.  Look for it in the active ingredient list. It is systemic and quite effective on aphids. Always read and follow label directions, but I have used it with great success.


From: "sdayres2@aol.com" <sdayres2@aol.com>
To: iris-photos@yahoogroups.com
Sent: Sunday, April 8, 2012 9:54 AM
Subject: Re: [iris-photos] Is this iris nutrient deficient?

Yes I do have aphids.  Would they prefer one variety over the other Arilbreds around them?  Question is what to use to get rid of the critters.  Soapy water doesn't get into the crevices.  You can buy ladybugs.  But the first thing they will do is exercise their wings and fly away.  Anybody know anyway to keep the ladybug critters in the yard?  You can buy preying mantis eggs.  But they are cannibalistic and the first ones out will fatten themselves on the siblings.   I don't know how to break apart the eggs from each other without damaging the eggs.  Anyone try green lacewings?
 I miss Disyston (spelling), but that has now been outlawed.  Anyway, I am trying to encourage the beneficial bugs.
In a message dated 4/8/2012 9:03:26 A.M. Mountain Daylight Time, ddbro@sbcglobal.net writes:
I have seen this type of damage with aphids and aphids love arilbreds!
Dana D. Brown
Malevil Iris Gardens & Kennels
www.malevil- iris.com
Lubbock, TX   79403
Zone 7 USDA, Zone 10 Sunset
ddbro@sbcglobal. net
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