I still think that water saturated ground will drown them. They need oxygen to survive, even in the soil. On Aug 5, 2013, at 8:35 AM, Glen Koehler wrote:
> Hi Art > See paragraph in last newsletter. Bottom line is sugar should also > increase efficacy of Assail and possibly Delegate against AM but nobody knows > if there would be other problems created by spraying sugar on apples. I find > the slow start to AM catches perplexing. Only speculation I have to explain > it is that they suffered high mortality in winter. But that might be wishful > thinking. Next few weeks will tell. > - Glen > > On Sun, Aug 4, 2013 at 8:45 AM, Arthur Kelly <[email protected]> wrote: > There is a recommendation to add sugar when making an application of Assail > for SWD on berries to stimulate feeding. 1-2 lbs per hundred gal. What > about for apples when using Assail or Delegate for instance? My > understanding is that when first emerged the flies feed. FYI we trapped the > first AM fly on 8/2 here. Only one on five traps. > > Art Kelly > Kelly Orchards > Acton, ME > > > On Fri, Aug 2, 2013 at 1:33 PM, David Kollas <[email protected]> wrote: > > > Thank you, Art. It is always better to know whether the most-informed > have the answers; or whether, instead, they are not sure either. > > The uncertainty that Reissig expressed in his paper of 2003 apparently > continues now ten years later. In that paper he indicated the need for > additional research to assess practical aspects of replacing organophosphates > with newer chemistries in commercial orchards. > > A practical aspect of using Calyso or Assail in leu of Imidan that is > separate from their mode of action on Apple Maggot, is the > question of how to incorporate them into a label-compliant > resistance-management program that includes control of many pests in addition > to Apple Maggot. > > David > > > > On Aug 2, 2013, at 11:53 AM, Arthur M. Agnello wrote: > >> Hi David, >> >> Harvey Reissig did a study on the efficacy of some of the newer products >> against apple maggot, and published it some years ago: >> >> Reissig, W. Harvey. 2003. Field and Laboratory Tests of New Insecticides >> Against the Apple Maggot, Rhagoletis pomonella (Walsh) (Diptera: >> Tephritidae). Journal of Economic Entomology 96 (5): 1463-1472 — I will >> send you a pdf of it in a separate email. >> >> However, his general findings were that there are no new insecticides that >> are as effective in controlling AM as the organophosphates, particularly in >> “high pressure situations”. It is also true that most of the new materials >> are not as directly toxic to the flies as the OPs, and the efficacy of many >> these new materials appears to be due to their ability to prevent flies from >> ovipositing as long as they are in contact with their residues. We really >> don’t know the mechanism of this mode of action, but in many laboratory >> bioassays the flies will not lay eggs on treated apples, although they >> remain alive. So far, we would say that in most normal US orchards, which >> are presumed to be initially free from internal AM infestations and are not >> near abandoned orchards and other large sources of unsprayed host trees, we >> have not seen control failures or even increased damage in orchards that are >> not treated with organophosphates, although AM catches in monitoring traps >> placed along the edges of these orchards appears to be higher than when they >> were sprayed with organophosphates. >> >> As far as efficacy, Calypso is definitely the most effective of the new >> insecticides, followed by Assail. Delegate and Altacor also have some >> activity, but would probably not provide control in orchards with internal >> infestations or those that are near heavy unsprayed sources of infestations. >> >> Art >> >> -- >> Arthur M. Agnello >> Professor and Extension Tree Fruit Entomologist >> Dept. of Entomology [email protected] >> N.Y.S. Agric. Expt. Sta. Tel: 315-787-2341 >> 630 W. North St. Fax: 315-787-2326 >> Geneva, NY 14456-1371 >> http://web.entomology.cornell.edu/agnello/links.html >> Scaffolds Fruit Journal online: >> http://www.scaffolds.entomology.cornell.edu/index.html >> >> From: Dave Kollas <[email protected]> >> Reply-To: Apple-crop discussion list <[email protected]> >> Date: Fri, Aug 2 10:44 AM >> To: Apple-crop discussion list <[email protected]> >> Subject: Re: [apple-crop] Residual pesticide activity >> >> >> 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: [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]> >>>> Date: July 31, 2013 9:08:52 AM EDT >>>> To: Apple-crop discussion list <[email protected]> >>>> Bcc: Kollas David <[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 >> >> _______________________________________________ >> apple-crop mailing list >> [email protected] >> http://virtualorchard.net/mailman/listinfo/apple-crop > > > _______________________________________________ > apple-crop mailing list > [email protected] > http://virtualorchard.net/mailman/listinfo/apple-crop > > > > > -- > Art Kelly > Kelly Orchards > Acton, ME > > _______________________________________________ > apple-crop mailing list > [email protected] > http://virtualorchard.net/mailman/listinfo/apple-crop > > > > > -- > Glen Koehler > University of Maine Cooperative Extension > Pest Management Office > Voice: 207-581-3882 > 491 College Avenue, Orono, ME 04473 > _______________________________________________ > apple-crop mailing list > [email protected] > http://virtualorchard.net/mailman/listinfo/apple-crop
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