North American Fruit Explorers mailing list at ibiblio

[<dmnorton@royaloakfarmorchard.com>]

Use of Imidan and Guthion alternatives for plum curculio control

Efficacy ratings below are from the Cornell University and Penn State University (PSU) tree fruit pest management guides ( http://www.nysaes.cornell.edu/ent/treefruit/ and http://www.cas.psu.edu/docs/CASDEPT/hort/TFPG/default.htm ).  Cornell uses a three-point scale (Good, Fair, Poor).  Penn State uses a four-point scale (Excellent, Good, Fair, Poor).  The PSU Excellent and Good ratings were combined to create this list.

        Imidan has the highest rating given by both the Cornell and PSU guides for plum curculio control.  Alternatives to Imidan and Guthion, sorted by efficacy rating:

        Excellent or Good: Asana**, Avaunt, Calypso, Warrior**.  Actara (PSU - Good),  Sevin (PSU - Good), Danitol** (PSU - Good), Diazinon* (PSU - Good), Permethrin** (PSU - Good).

        Fair: Diazinon* (Cornell), Dimethoate*, Lannate* & **, Sevin* (Cornell), Surround, Thiodan (PSU, Cornell - not effective).

Notes for above listings

* = organophosphate or carbamate (Diazinon, Dimethoate, Lannate, Sevin).  A primary intent of restricting Imidan use is to reduce overall worker exposure to residues of the organophosphate/carbamate group.  Curtailed Imidan use that leads to increased use of another member of this group does not seem to support that objective.

** = pyrethroid or Lannate.  Use of these materials is considered disruptive to naturally occurring populations of beneficial arthropod pest predators and parasites.  Permethrin cannot be used after petal fall.

Dennis Norton
Royal Oak Farm Orchard
http://www.royaloakfarmorchard.com
http://www.theorchardkeeper.blogspot.com
http://www.revivalhymn.com

----- Original Message -----

From: Mark & Helen Angermayer

To: North American Fruit Explorers

Sent: Sunday, April 06, 2008 4:03 PM

Subject: Re: [NAFEX] chemical pest control

Hi Alan,

 

The late Tom Vorbeck (on the Website) recommends Malathion, as it is easier on mite predators than Sevin (He used to recommend Imidan, but it's no longer approved for use in residential areas.)  Everyone says if you use something like Sevin or a pyrethroid season long, you get mite explosions.  Last summer I sprayed my green beans too many times with a pyrethroid and did develop a mite problem ( I've tried not spraying before and you get the most bug damaged scarred things you've ever seen.  They're OK to eat, as long as you keep your eyes closed.)

 

But perhaps apples are a little tougher.  Have you ever seen mite's that have caused problems on any of the small orchards you manage?

 

Mark

KS

----- Original Message -----

From: Alan Haigh

To: nafex@lists.ibiblio.org

Sent: Sunday, April 06, 2008 6:20 AM

Subject: [NAFEX] chemical pest control

I would never use malathion for curculio unless I was closely monitoring for the pest and very confident of my timing.  I think I'd rather use even Surround, on the basis of efficacy alone, just because it provides twice the duration of protection although that protection is not complete.  For those unwilling or unable to use phosmet (Imidan), I'd recommend Sevin as would the commercial consultants that I'm aware of.

 

Some states do not allow Avaunt for non--commercial applications but it is very affective against curc.  Unfortunately it doesn't control a slew of other pests that Imidan and Sevin do.

 

The question of the safety of using organophosphates is a little complicated but the government is phasing them out, whatever you want to read into that.  Personally, I don't think that a hobbyist doing very little spraying is at any great risk if they limit their exposure as much as possible.  I don't look forward to a world where I can no longer purchase Imidan for use in my very low-spray program.  It will be very difficult for me to protect the scores of small orchards for which I'm now responsible.

---

_______________________________________________
nafex mailing list
nafex@lists.ibiblio.org

Reproduction of list messages or archives is not allowed.
This includes distribution on other email lists or reproduction on web sites.
Permission to reproduce is NEVER granted, so don't claim you have permission!

**YOU MUST BE SUBSCRIBED TO POST!**
Posts from email addresses that are not subscribed are discarded.
No exceptions. 
----
To subscribe or unsubscribe, go to the bottom of this page (also can be used to change other email options):
http://lists.ibiblio.org/mailman/listinfo/nafex

File attachments are NOT stripped by this list.
TAKE STEPS TO PROTECT YOURSELF FROM COMPUTER VIRUSES!
Please do not send binary files.
Use plain text ONLY in emails!

NAFEX web site:   http://www.nafex.org/

---

No virus found in this incoming message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.22.8/1362 - Release Date: 4/6/08 11:12 AM