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Appl Environ Microbiol. 1985 November; 50(5): 1229-1232
Copyright © 1985, American Society for Microbiology. All Rights Reserved.

Aerial Dispersal of Epiphytic Bacteria over Bean Plants

Julianne Lindemann{dagger} and C. D. Upper*

Department of Plant Pathology, Agricultural Research Service, U.S. Department of Agriculture, University of Wisconsin, Madison, Wisconsin 53706

ABSTRACT

Plant canopies are strong sources of bacterial aerosols during sunny days when the leaves are dry. Bacterial concentration, upward flux, and deposition onto exposed petri plates were measured over snap beans during three growing seasons. A net upward flux of bacteria occurred only during the warm part of sunny days, not at night when leaves were wet with dew or when a thermal inversion was present. Aerosol source strength was positively correlated with wind speed. Upward fluxes were higher on days after rain than on days when the soil was dry. Other unidentified sources of variability in source strength probably exist. Canopy-level deposition, apparently due to intermediate-scale transport of bacteria in fairly concentrated clouds, can occur in the early evening.

FOOTNOTES

* Corresponding author.

{dagger} Present address: Advanced Genetic Sciences, Inc., Oakland, CA 94608.

Appl Environ Microbiol. 1985 November; 50(5): 1229-1232
Copyright © 1985, American Society for Microbiology. All Rights Reserved.



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