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Aircraft-applied sulfur for control of powdery mildew (erysiphe cichoracearum) on potato in washington state

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Aircraft-applied dust and liquid sulfur sprays were evaluated for control of powdery mildew (Erysiphe cichmacearumDC), on rill irrigated potatoes (cv. Russet Burbank). Either form of sulfur applied weekly or biweekly usually controlledE. chichoracearum through September, but not in October. Significant yield increases were obtained in only two of five trials. The small differences in disease severity between weekly and biweekly applications of sulfur were not significant. Sulfur gave very little control if applied after infection was established. Applications of liquid sulfur, the formulation less likely to cause environmental problems, should be started at the first trace of stipples on stems and continued biweekly throughout the season.


Se evaluaron aplicaciones aéreas de azufre en forma líquida y en polvo para el control del oidium (Erysiphe cickoracearum DC), en papas cv. Russet Burbank irrigadas por surcos. Cualesquiera de las dos formas de aplicación, efectuadas semanalmente o cada dos semanas, controlaron por lo general alE. cickoracearum durante setiembre, pero nó en octubre. Se obtuvieron incrementos significativos solamente en dos de cinco ensayos. Las pequeñas diferencias en la serveridad de la enfermedad entre las aplicaciones de azufre efectuadas semanalmente o cada dos semanas no fueron significativas. El azufre efectuó un control muy reducido cuando se aplicó después del establecimiento de la enfermedad. Las aplicaciones de azufre en forma líquida, la fórmula que parecía la que causaba los menores problemas en el ambiente, deben empezarse apenas se noten los primeros síntomas de la enfermedad en los tallos y continuarse cada dos semanas durante toda la temporada.

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Author information

Correspondence to G. D. Easton or M. E. Nagle.

Additional information

PPNS No. 0019. College of Agriculture and Home Economics Research Center, Washington State University, Pullman, WA 99164. Project No. 1709.

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Easton, G.D., Nagle, M.E. Aircraft-applied sulfur for control of powdery mildew (erysiphe cichoracearum) on potato in washington state. American Potato Journal 67, 385–392 (1990). https://doi.org/10.1007/BF02987280

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  • Powdery Mildew
  • AMERICAN Potato Journal
  • Russet Burbank Potato
  • Sulfur Treatment
  • Norgold Russet