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A Device for Uniform Deposition of Liquid-Suspended Urediospores on Seedling and Adult Cereal Plants. M. W. Andres, Former graduate student, Department of Plant Pathology, University of Minnesota, St. Paul 55108; R. D. Wilcoxson, professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Phytopathology 74:550-552. Accepted for publication 16 January 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-550.

A device that uniformly deposits liquid-suspended urediospores on seedling and adult cereal plants consists of a pneumatic cylinder which moves an atomizer upward at a constant, regulated speed. During the upward movement of that atomizer, air at a constant pressure from another pump is directed into the atomizer and a uniform cone-shaped cloud of urediospores suspended in liquid is sprayed onto the surface of the plants. The efficiency of the inoculation device was tested by spraying a range of concentrations of urediospores of Puccinia hordei suspended in light mineral oil onto double-stick plastic tape, primary leaves of seedlings, and flag leaves of adult barley plants. Uniform inoculations were achieved; standard errors of the mean were small in all experiments. The device is equally well suited for seedlings and adult plants, inexpensive to construct, and easy to use.