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Full-Text Articles in Agriculture
Digital Analysis Of Leaf Surface Area: Effects Of Shape, Resolution, And Size, Jeffrey Bradshaw, Marlin E. Rice, John W. Hill
Digital Analysis Of Leaf Surface Area: Effects Of Shape, Resolution, And Size, Jeffrey Bradshaw, Marlin E. Rice, John W. Hill
Panhandle Research and Extension Center
The effects of shape, size, and capture resolution on digital area measurement were investigated to accurately and precisely estimate leaf surface area. A digital scanner was used to measure two simple shapes (circle and square) at three resolutions (118.159, 236.270 and 472.441 pixels/cm) and five sizes (3.14, 12.58, 28.29, 50.29, and 78.60 cm2). Additionally, the accuracy and precision of two digital scanner models were compared using two shapes (circle and square) of similar size at five resolutions (29.528, 39.370, 59.055, 118.159, 236.270, and 472.440 pixels/cm). A method is described to measure leaf area using an image histogram and …
No-Choice Preference Of Cerotoma Trifurcata (Coleoptera: Chrysomelidae) To Potential Host Plants Of Bean Pod Mottle Virus (Comoviridae) In Iowa, Jeffrey Bradshaw, Marlin E. Rice, John H. Hill
No-Choice Preference Of Cerotoma Trifurcata (Coleoptera: Chrysomelidae) To Potential Host Plants Of Bean Pod Mottle Virus (Comoviridae) In Iowa, Jeffrey Bradshaw, Marlin E. Rice, John H. Hill
Panhandle Research and Extension Center
To better understand the naturally occurring host range of Bean pod mottle virus (family Comoviridae, genus Comovirus, BPMV) and its principal vector Cerotoma trifurcata (Förster) (Coleoptera: Chrysomelidae), 18 field-collected perennial plant species were tested for the presence of BPMV. By using no-choice assays, we determined the preference of these plants by bean leaf beetle, by measuring their level of herbivory relative to soybean, Glycine max (L.). New food hosts for adult bean leaf beetles include Lespedeza capitata (Michaux), Lotus corniculatus L., Trifolium alexandrinum L., Trifolium ambiguum Bieberstein, and Trifolium incarnatum L. Desmodium illinoense Gray is discovered as a …