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Herbicide-Root Rot Interaction in Navy Bean

Published online by Cambridge University Press:  12 June 2017

Donald L. Wyse
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
William F. Meggitt
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
Donald Penner
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55101

Abstract

Navy bean (Phaseolus vulgaris L.) seedlings grown in soil treated with EPTC (S-ethyl dipropylthiocarbamate) were more susceptible to root rot caused by Fusarium solani (Mart.) Appel and Wr. f. phaseoli (Burk.) Snyd. and Hans. than were control seedlings. The navy bean line ‘RRR041,’ which is moderately resistant to root rot, did not show reduced growth when grown in soil infested with F. solani and treated with EPTC. None of the several herbicides tested increased F. solani chlamydospore virulence when grown on potato dextrose agar supplemented with herbicides. No herbicide tested increased F. solani hyphal development in liquid culture or soil. Dinoseb (2-sec-butyl-4,6-dinitrophenol) reduced hyphal development by the greatest amount. Scanning electron micrographs indicated that navy bean plants grown in EPTC had altered hypocotyl surfaces. EPTC and dinoseb increased the exudation of electrolytes, amino acids, and sugars from root and hypocotyl tissue.

Type
Research Article
Copyright
Copyright © 1976 by the Weed Science Society of America 

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