Techniques for Screening Chemicals for Fire Blight Control. J. L. Norelli, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva 14456. J. D. Gilpatrick, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva 14456. Plant Dis. 66:1162-1165. Accepted for publication 26 April 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-1162.

Two in vivo methods are described for screening chemicals for control of fire blight of apple caused by Erwinia amylovora. One method uses immature pear fruit tissue and the other, germinating apple seedlings. The immature pear fruit tissue test predicted the field activity of all chemicals tested. The germinating apple seedling test predicted the activity of the antibiotics, copper compounds, and fungicides tested but failed to predict the activity of some synthesized organic compounds.

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