Re: Weed control and fungal leaf spot control
iris@hort.net
  • Subject: Re: Weed control and fungal leaf spot control
  • From: B* C* <b*@ymail.com>
  • Date: Fri, 1 Apr 2011 22:39:03 -0700 (PDT)
Hi Robert,

I was hoping someone with first hand information about your two pests might 
respond, but seeing no responses, I'll try to help. I am a retired entomologist 
but have not had to deal with either of these two pests.

Please be aware not all products are available in all states, so always refer to 
the label and consider asking the local Cooperative Extension office in your 
county for help.  There may also be a Master Gardner program in your area (you 
can contact them thru the Cooperative Extension Office also), and they can be 
very helpful.   

Two systemic insecticides come to mind that might help.  One is imidacloprid, 
sold under trade names like Merit or Marathon or Bayer Advanced Tree and Shrub 
Insect Control.  It is very good for aphids and caterpillar pests (like Verbena 
Bud Moth) but not good on fly larvae (like iris bud fly).  It is a fairly safe 
material, but somewhat expensive.

The second is dimethoate (Trade Name Cygon).  It is an organophosphate 
insecticide and should be used very carefully.  It is more likely to be 
effective against iris bud fly.

If you have questions which I might help with, please let me know.
Bill




imidacloprid 


________________________________
From: Robert Treadway <robertt01@earthlink.net>
To: iris@hort.net
Sent: Fri, April 1, 2011 7:07:10 AM
Subject: Re: [iris] Weed control and fungal leaf spot control

Does anyone have any suggestions for a systemic insecticide?  I will be battling 
the Verbena Bud Moth and Orthochaeta or "iris bud fly" in a few weeks.  Last 
year I tried some granular product but it didn't seem to have any affect on the 
iris bud fly which was eating up the inside of the blooms at a record rate.  I 
am mainly growing Louisiana Irises in lined beds and really worry about putting 
very much into the soil as it will not leach out and will have to break down.  


It seems that the chemicals available have changed and gotten so complicated 
that I can't pronounce or remember what the even are.  I am thinking that 
something that I can spray the entire plant with would work better but don't 
have any idea which will work best.

Any suggestions or experiences will help.

Robert Treadway
Carlisle, Arkansas

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