User profiles for D. C. Percival

David Percival

Professor of Whole Plant Physiology, Dalhousie University
Verified email at DAL.ca
Cited by 2225

Use of fruit zone leaf removal with Vitis vinifera L. cv. Riesling grapevines. II. Effect on fruit composition, yield, and occurrence of bunch rot (Botrytis cinerea Pers.: Fr.)

DC Percival, KH Fisher… - American journal of …, 1994 - Am Soc Enol Viticulture
Leaf removal treatments were applied to Vitis vinifera L. cv. Riesling grapevines of varying
vigor at two locations in the Niagara Region during the 1990 and 1991 seasons to control leaf …

Development of prototype automated variable rate sprayer for real-time spot-application of agrochemicals in wild blueberry fields

…, TJ Esau, AW Schumann, DC Percival… - … and Electronics in …, 2011 - Elsevier
An automated prototype variable rate (VR) sprayer was developed for control of 8 individual
nozzles on a 6.1m sprayer boom for in-season, site-specific application of agrochemicals on …

Spot-application of fungicide for wild blueberry using an automated prototype variable rate sprayer

…, QU Zaman, YK Chang, AW Schumann, DC Percival… - Precision …, 2014 - Springer
Wild blueberry producers apply fungicide uniformly without considering significant bare spots
in the field. The wrong or over use of fungicide in bare spots results in an increased cost of …

Estimation of wild blueberry fruit yield using digital color photography

QU Zaman, AW Schumann, DC Percival… - Transactions of the …, 2008 - elibrary.asabe.org
The wild blueberry industry of North America may benefit significantly from precision
agriculture technology. Currently, crop management practices are implemented on an average …

[PDF][PDF] Effect of cluster exposure, berry contact and cultivar on cuticular membrane formation and occurrence of bunch rot(Botrytis cinerea PERS.: FR.) with 3 Vitis …

DC Percival, JA Sullivan, KH Fisher - Vitis, 1993 - core.ac.uk
Leaf removal treatments were applied to Riesling during 1990 and 1991, a! ld to Cabernet
franc and Optima in 1991. Shaded and exposed clusters of Riesling were sampled prior to …

Delineating management zones for site specific fertilization in wild blueberry fields

…, A Madani, DC Percival - Applied …, 2012 - dalspace.library.dal.ca
… Under fertilization restricts yield and can reduce berry quality (Percival and Sanderson, 2004).
… Zaman, QU, AW Schumann, and DC Percival. 2010b. An automated slope measurement …

Development of color co-occurrence matrix based machine vision algorithms for wild blueberry fields

…, QU Zaman, AW Schumann, DC Percival… - Applied engineering …, 2012 - elibrary.asabe.org
Co-occurrence matrix-based textural features were analyzed and three algorithms were
developed to identify bare spots, wild blueberry plants, and weeds with the aim of applying …

Use of fruit zone leaf removal with Vitis vinifera L. cv. Riesling grapevines. I. Effects on canopy structure, microclimate, bud survival, shoot density, and vine vigor

DC Percival, KH Fisher… - American Journal of …, 1994 - Am Soc Enol Viticulture
Fruit zone leaf removal treatments were applied to Vitis vinifera L. cv. Riesling grapevines at
two locations in the temperate Canadian Niagara Region during 1990 and 1991. Leaf …

Tolerance of lowbush blueberries (Vaccinium angustifolium Ait.) to drought stress. I. Soil water and yield component analysis

VM Glass, DC Percival… - Canadian journal of plant …, 2005 - cdnsciencepub.com
A 2-yr field study examining the effects of drought conditions on the vegetative and reproductive
components of the lowbush blueberry (Vaccinium angustifolium Ait.) was completed at …

Computer vision system for wild blueberry fruit yield mapping

…, QU Zaman, AW Schumann, DC Percival… - Biosystems …, 2010 - Elsevier
Wild blueberry (Vaccinium angustifolium Ait.) is a unique crop native to Northeastern North
America with annual production of 82,000t from an area of 79,000ha. Yield maps along with …