Thank you for that, Peter.
I suppose that if the systemic activity of neonics is sufficient to
kill Apple Maggot eggs or larvae during a (two week?) period after application,
and up to 2 inches rainfall, they could be expected to be as good as
Imidan or Guthion, regardless of whether the adults are killed by fruit or
foliar contact.
Or, perhaps female flies are killed by ovipositor contact with systemic
neonic during egg insertion? My guess is that such studies have not been made.
David Kollas
On Aug 2, 2013, at 8:55 AM, Peter J. Jentsch wrote:
> Hi David,
>
> John Wise, Michigan State University, Department of Entomology, wrote a very
> nice piece on the 'Rainfast characteristics of fruit crop insecticides' that
> might help to answer these questions. It was posted on June 3, 2013.
>
> http://msue.anr.msu.edu/news/rainfast_characteristics_of_fruit_crop_insecticides
>
> All the best,
>
>
> Peter J. Jentsch
> Senior Extension Associate - Entomology
> Department of Entomology
> Cornell University’s Hudson Valley Lab
> P.O. Box 727, 3357 Rt. 9W
> Highland, NY 12528
>
> Office: 845-691-7151
> Cell: 845-417-7465
> FAX: 845-691-2719
>
> E-mail: p...@cornell.edu
> http://hudsonvf.cce.cornell.edu/bmsb1.html
> http://web.entomology.cornell.edu/jentsch/links.html
> From: apple-crop-boun...@virtualorchard.net
> [apple-crop-boun...@virtualorchard.net] on behalf of David Kollas
> [kol...@sbcglobal.net]
> Sent: Wednesday, July 31, 2013 8:50 PM
> To: apple-crop@virtualorchard.net
> Subject: [apple-crop] Fwd: Residual pesticide activity
>
> Perhaps the sending address I used this morning was wrong. I am trying
> another now.
>
> Begin forwarded message:
>
>> From: David Kollas <kol...@sbcglobal.net>
>> Date: July 31, 2013 9:08:52 AM EDT
>> To: Apple-crop discussion list <apple-crop@virtualorchard.net>
>> Bcc: Kollas David <kol...@sbcglobal.net>
>> Subject: Residual pesticide activity
>>
>> All:
>> Surely others know the answer to this question. I must have missed it
>> somewhere. Does the systemic activity of
>> absorbed neonicotinoid sprays Assail and Calypso replace the surface
>> residual that continues to kill Apple Maggot flies
>> entering an Imidan or Guthion-treated orchard days after the application?
>> Do the neonics provide residual control only by
>> systemic tissue-presence which the insect must consume? Or do Apple Maggot
>> flies get enough active ingredient through
>> their "feet" to kill them on days-old neonic treatments?
>> The question is relevant in choosing whether, and what pesticide to apply
>> prior to forecast thunderstorms that can
>> remove surface residues.
>>
>> David Kollas
>> Kollas Orchard, Tolland, CT
>
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