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Influence of Benomyl Soil Treatment on Pinto Bean Plants Exposed to Peroxyacetyl Nitrate and Ozone. Eva J. Pell, Assistant Professor, Department of Plant Pathology and Center for Air Environment Studies, The Pennsylvania State University, University Park 16802; Phytopathology 66:731-733. Accepted for publication 10 November 1975. DOI: 10.1094/Phyto-66-731.

The ability of soil drench applications of benomyl to protect pinto bean plants from injury by peroxyacetyl nitrate (PAN) or combinations of PAN and ozone was tested. Following a 7-day treatment with 0, 60, 80, or 100 µg benomyl/g soil, 15-day-old pinto beans were exposed to 745 µg/m3 PAN or 745 µg/m3 PAN and 492 µg/m3 ozone for 3 hours. Benomyl did not protect the young primary leaves of these plants from either pollutant regime. When 20-day-old plants were exposed to the same dose of ozone and PAN following a 7-day benomyl treatment, the older primary leaves were protected.

Additional keywords: air pollution, Phaseolus, systemic fungicide.