Influence of Benomyl Soil Treatment on Pinto Bean Plants Exposed to Peroxyacetyl Nitrate and Ozone

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Abstract
The ability of soil drench applications of benomyl to protect pinto [Phaseolus vulgaris] 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 .mu.g benomyl/g soil, 15 day old pinto beans were exposed to 745 .mu.g/m3 PAN or 745 .mu.g/m3 PAN and 492 .mu.g/m3 ozone for 3 h. 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.

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