JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 1:450-452 (1972)
© 1972 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Differential Effect of Fungicides on Ozone Injury and Brown Spot Disease of Tobacco1

Richard A. Reinert2 and Harvey W. Spurr, Jr.3

ABSTRACT

The differential effects of fungicidal applications on the incidence of ozone injury and injury from Atlernaria alternata Fr. Keissel infection on tobacco Nicotiana tabacum L. leaves were investigated. Spray applications of methyl 1-butylcarbamoyl-2-benzimidazolecarbamate (benomyl) were made to two cigar wrapper cultivars, ‘Bel W3’ and ‘Florida 2612’ in the field. Applications of dodecylguanidine acetate (dodine) and manganous ethylenebisdithiocarbamate (maneb) were also observed on tobacco cultivar Bel W3. The ozone and A. alternata injuries were observed before and after fungicidal applications. All of the fungicidal applications significantly decreased ozone injury to tobacco leaves. Benomyl was most effective, decreasing leaf injury by 59%. Maneb and dodine were less effective. Maneb significantly decreased brown spot by 66% and benomyl and dodine produced smaller decreases in brown spot. The results demonstrated the differential responses of these two leaf diseases to fungicidal applications.

Key Words: oxidant • Alternaria alternata • benomyl • dodine • maneb

NOTES

1 Cooperative investigations of the USDA and the North Carolina State Univ. Paper no. 3597 of the Journal Series of the North Carolina State Univ. Agr. Exp. Sta., Raleigh 27607.

2 Plant Pathologist, Plant Science Research Div., ARS, USDA, North Carolina State Univ., Raleigh.

3 Plant Pathologist, Tobacco and Sugar Crops Research Branch, Plant Sci. Res. Div., ARS, USDA, Oxford, North Carolina.

Received for publication February 15, 1972.




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The SCI Journals Agronomy Journal Crop Science
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Copyright © 1972 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.