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/

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 <apple-crop@virtualorchard.com>
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

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Maurice Tougas
Tougas Family Farm
Northborough,MA 01532
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