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This article in AJ

  1. Vol. 63 No. 1, p. 107-111
     
    Received: June 10, 1970


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doi:10.2134/agronj1971.00021962006300010033x

Susceptibility of Wisconsin Havana Tobacco Cultivars to Air Pollutants

  1. G. H. Hodges,
  2. H. A. Menser2 and
  3. W. B. Ogden3

Abstract

Abstract

Wisconsin Havana cigar tobacco cultivars were tested for susceptibility to air pollutants in a plant exposure chamber and in a tobacco field. Gases used in the chamber were ozone, sulfur dioxide, and a mixture of the two. Ozone was the principal air pollutant to affect field grown plants. ‘Havana 142’ was the most susceptible cultivar to ozone fumigations and to ozone induced, field disorder, weather fleck. ‘Havana 501’ exhibited about half the leaf injury of Havana 142 when exposed to the same ozone conditions. Other cultivars that showd intermediate response were ‘Havana 307,’ ‘Havana 425,’ and ‘Havana’ 503 No injury resembling “Target Spot”, a nonpathogenic syndrome observed in Wisconsin on Havana 503, was produced in any of the tests. All injury resembled the ozone fleck consisting of punctate lesions on upper surfaces of mature leaves. A low concentration mixture of ozone (0.03 ppm) and sulfur dioxide (ca. 0.45 ppm) caused from 5 to 15% injury but individual gases used at the same rates caused no symptoms. Mixed gas injury differed very little from ozone flecks.

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