Systemic movement in cucumber plants and control of cucumber gray mould by a new fungicide, S-7131

Abstract

Carbon-14-labelled S-7131 (N-(3′,5′-dichlorophenyl)-1,2-dimethylcyclopropane-1,2-dicarboximide) penetrated into the treated leaves of cucumber plants, moved to the stem and was then translocated both upwards and slightly downwards. Also through roots the fungicide was readily taken up and translocated to aerial parts. Autoradiographs showed that S-7131 had a tendency to accumulate at the leaf margin. In experiments with cucumber plants bearing flowers and fruits it was shown that S-7131 hardly moved from foliage to flowers and fruits. TLC analysis of radioactive extracts showed that S-7131 moved within plants in the unaltered form. Bioassay tests confirmed that systemic movement of S-7131 contributed to its high efficacy in disease control.