Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1973
Published in Agron J 65:112-115 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Interaction of Selected Pesticides and Rhizobium japonicum in Pure Culture and Under Field Conditions1

George Kapusta and D. L. Rouwenhorts2

Investigations were conducted to determine the influence of selected pesticides on the growth of Rhizobium japonicum Kirch. Buch. in pure culture and in soil. In addition, nodulation and seed yield of inoculated soybeans [Glycine max (L.) Merr. cultivar ‘Wayne’] were studied under field conditions.

Commercial formulations of 24 pesticides were screened for bacteriostatic activity on rhizobia using a gradient plate technique. Isopropyl m-chlorocarbanilate (chlorpropham) and o,o-diethyl-s-[2-(ethylthio)-ethyl] phosphorodithioate (disulfoton) were the only pesticides that inhibited growth. In addition to these pesticides, 4-(methylsulfonyl)-2,6-dinitro-N, N-dipropylaniline (nitralin) and 1-napthyl N-methylcarbamate (carbaryl) were selected for further study to substantiate the laboratory results.

Six XI. S. Department of Agriculture rhizobia strains were cultured in pesticide-amended medium 79 and subsequent growth was determined turbidimetrically. Nitralin exhibited little effect on the rhizobia, whereas chlorprophram, disulfoton, and carbaryl evoked a differential strain response.

Most probable number determinations of pesticidetreated soil samples indicated that naturalized soil populations of R. japonicum remained unaltered four weeks after pesticide application. Recommended rates of the pesticides studied did not influence soybean nodulation or seed yield.

Key Words: Nodulation • Soybean • Herbicides • Insecticides • Fungicides

1 Contribution from Southern Illinois University, School of Agriculture. Carbondale, 111. 629.01. Part of a thesis submitted by the junior author in partial fulfillment of the requirementsfor the degree of M.S. in Agriculture, Plant Industry Department.

2 Superintendent, Plant Industry Research Stations and Graduate Research Assistant, respectively. Plant Industry Department. Current address of the junior author is The Rudy-Patrick Commany, Princeton, III.

Received for publication May 9, 1972.




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Environmental Quality		 The Plant Genome
Copyright © 1973 by the American Society of Agronomy.