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: [email protected] http://hudsonvf.cce.cornell.edu/bmsb1.html http://web.entomology.cornell.edu/jentsch/links.html ________________________________ From: [email protected] [[email protected]] on behalf of David Kollas [[email protected]] Sent: Wednesday, July 31, 2013 8:50 PM To: [email protected] 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 <[email protected]<mailto:[email protected]>> Date: July 31, 2013 9:08:52 AM EDT To: Apple-crop discussion list <[email protected]<mailto:[email protected]>> Bcc: Kollas David <[email protected]<mailto:[email protected]>> 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
_______________________________________________ apple-crop mailing list [email protected] http://virtualorchard.net/mailman/listinfo/apple-crop
