Modification of Succinic Acid-2,2-Dimethylhydrazide Growth Inhibition of Bean Plants by Surfactants1

Abstract

Abstract The effects of surfactants on spray retention and penetration of succinic acid-2,2-dimethylhydrazide (SADH) were determined by following growth inhibition of the first and second internode following SADH treatment of the primary leaves of an indeterminant bean (Phaseolus vulgaris L. cv. Blue Lake) plant. Surfactants (0.1%) decreased the retention of the SADH treating solution by the primary leaves thus reducing the potential dose delivered. The initial rate of SADH penetration was increased with surfactants, but the total amount penetrating was not significantly altered. Internode elongation of the ‘Blue Lake’ bean was enhanced by surfactants per se. Surfactant enhanced penetration of SADH resulted in increased inhibition of internode extension only when the absorption period was limited to 4 hr or less.