What about mating disruption for LAW? Lorraine Los Retired UConn IPM Specialist
On Aug 5, 2013, at 1:06 PM, David Kollas <kol...@sbcglobal.net> wrote: > Glen: > > My glee at the minimal captures of Apple Maggot on this farm is > tempered by my history of Lesser Appleworm. It has produced significant > damage to fruit when I have omitted insecticide in August. Now I am thinking > that LAW traps may be needed to justify the insecticide. > > David Kollas > Kollas Orchard > Tolland, CT > > > On Aug 5, 2013, at 8:35 AM, Glen Koehler <glen.koeh...@maine.edu> 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 <kellyorcha...@gmail.com> 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 <kol...@sbcglobal.net> 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 a...@cornell.edu >>>>> 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 <kol...@sbcglobal.net> >>>>> Reply-To: Apple-crop discussion list <apple-crop@virtualorchard.net> >>>>> Date: Fri, Aug 2 10:44 AM >>>>> To: Apple-crop discussion list <apple-crop@virtualorchard.net> >>>>> 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: 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 >>>>>> >>>>>> _______________________________________________ >>>>>> apple-crop mailing list >>>>>> apple-crop@virtualorchard.net >>>>>> http://virtualorchard.net/mailman/listinfo/apple-crop >>>>> >>>>> _______________________________________________ >>>>> apple-crop mailing list >>>>> apple-crop@virtualorchard.net >>>>> http://virtualorchard.net/mailman/listinfo/apple-crop >>>> >>>> >>>> _______________________________________________ >>>> apple-crop mailing list >>>> apple-crop@virtualorchard.net >>>> http://virtualorchard.net/mailman/listinfo/apple-crop >>> >>> >>> >>> -- >>> Art Kelly >>> Kelly Orchards >>> Acton, ME >>> >>> _______________________________________________ >>> apple-crop mailing list >>> apple-crop@virtualorchard.net >>> 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 >> apple-crop@virtualorchard.net >> http://virtualorchard.net/mailman/listinfo/apple-crop > > _______________________________________________ > apple-crop mailing list > apple-crop@virtualorchard.net > http://virtualorchard.net/mailman/listinfo/apple-crop
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