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  • Author or Editor: J. Schonherr x
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Abstract

Translocation of SADH was studied in young apple (Malus domestica Bork.) and peach (Prunus persica L.) trees using inhibition of shoot extension and distribution of 14C from foliar-applied 14C-SADH as indices of translocation. Two shoots were allowed to develop on each tree approximately 15 cm apart and orientated; in opposite directions. SADH (5000 ppm) inhibited elongation of the treated shoot but had not significant effect on elongation of the nontreated shoot. This response was independent of whether the upper or lower shoot was treated. In peaches, growth (dry wt) of the non treated shoot was greater than comparable shoots on control trees. These data suggest that SADH was not translocated into neighboring shoots. The absence of translocation of 14C from labeled SADH from treated to nontreated shoots was confirmed by radioautography.

Open Access

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.

Open Access