Abstract
Navy bean (Phaseolus vulgarisL.) seedlings grown in soil treated with EPTC (S-ethyl dipropylthiocarbamate) were more susceptible to root rot caused byFusarium 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 withF. solaniand treated with EPTC. None of the several herbicides tested increasedF. solanichlamydospore virulence when grown on potato dextrose agar supplemented with herbicides. No herbicide tested increasedF. solanihyphal 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.
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