We call that observer bias. That said (and I’m not an SWD researcher), there can be characteristics about certain crops, such as cuticle thickness, canopy architecture, ‘nooks and crannies’, etc. that can affect both the material’s ability to hang around and maintain contact with the pest as well as the insect’s behavior within the plant canopy, so I could imagine that materials may have different ratings on different crops even if that bias were removed.
-------------------------------------- Terence Bradshaw, Ph.D. Research Assistant Professor Tree Fruit and Viticulture Specialist University of Vermont Plant and Soil Science 210 Jeffords Hall / 63 Carrigan Drive Burlington, VT 05405 Information for commercial orchard and vineyard managers in Vermont and beyond: http://www.uvm.edu/~fruit / https://www.facebook.com/UVM.Fruit/ Director UVM Horticulture Research and Education Center Catamount Educational Farm 65 Green Mountain Drive, South Burlington, VT (No US Mail Service at Farm) http://www.uvm.edu/~hortfarm / https://www.facebook.com/UVM.CatFarm (802)656-0972 (office) / (802)922-2591 (cell) Funded in part by USDA NIFA. This institution is an equal opportunity provider. From: apple-crop-boun...@virtualorchard.com [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of maurice tougas Sent: Tuesday, July 17, 2018 8:59 PM To: Apple-crop discussion list <firstname.lastname@example.org> Subject: Re: [apple-crop-2] Efficacy Different person producing the rating Art. On Tue, Jul 17, 2018 at 7:48 PM Arthur Kelly <kellyorcha...@gmail.com<mailto:kellyorcha...@gmail.com>> wrote: Can someone explain why an insecticide might be excellent for SWD on one crop but only moderate on another crop. Art Kelly Kelly Orchards Acton, Maine Sent from my iPhone _______________________________________________ apple-crop mailing list email@example.com<mailto:firstname.lastname@example.org> http://virtualorchard.net/mailman/listinfo/apple-crop -- Maurice Tougas Tougas Family Farm Northborough,MA 01532 508-450-0844
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