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Controlled Droplet Applicators for Inoculation with Plant Pathogens. J. B. Perry, Specialist, Department of Plant Pathology, University of Wisconsin, Madison 53706. P. H. Williams, Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Plant Dis. 68:107-108. Accepted for publication 7 August 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-107.

The MicroULVA controlled droplet applicator was evaluated as a tool for inoculating plant pathogens in the field and greenhouse. Diseases caused by Albugo candida race 2, Uromyces phaseoli, Pseudomonas lachrymans, and Colletotrichum orbiculare were severe and uniformly distributed when large spray droplets (6070 μm) were used in the field and greenhouse. Incidence of A. candida and U. phaseoli in the greenhouse decreased when small droplets (3040 μm) were used; however, severe disease of Xanthomonas campestris in field plots of cabbage occurred after inoculation with small droplets. Small volumes of inoculum were used, making this inoculator a potentially valuable tool for field use.