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Leaf Surface Electrostatics: Apparatus and Procedures Used Under Controlled and Natural Conditions. C. M. Leach, Professor, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331; Phytopathology 74:701-703. Accepted for publication 13 February 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-701.

Described are the procedures and the apparatus used to measure the intensity of electrostatic fields associated with the surfaces of detached leaves in controlled experiments as well as under natural conditions. Under controlled conditions, the apparatus can be used to investigate the effects of changes in atmospheric humidity, red-infrared radiation, and air velocity on leaf surface electrostatic fields. To measure electrical field intensity, an electrostatic sensor (field mill) is positioned 10 mm above a leaf surface, using a standardized leaf disk 55 mm in diameter. Procedures are described to minimize electrical changes associated with handling of leaves, including the use of insulated scissors, insulated forceps, and rubber gloves.