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  • Author or Editor: W. E. Tozer x
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Abstract

Six species of seedling trees were foliar-treated in greenhouse experiments with 7 - ox ab icyclo(2,2,l)heptane-2,3-dicarboxylic acid (endothall) mixed with (2 chloroethyl) phosphonic acid (ethephon). A range of 75 to 100% abscission was obtained within 14 days with little or. no damage except on Chinese elm (Ulmus parvifolia Jacq.).

Open Access

Abstract

To explain the synergistic interaction on abscission between 7-oxabicyclo(2,2,l)heptane-2,3-dicarboxylic acid (endothall) and (2-chloroethyl)phosphonic acid (ethephon), absorption and translocation of foliarly-applied 14C-ethephon alone or together with endothall were determined with (Phaseolus vulgaris L. cv. Red Kidney) plants using liquid scintillation, autoradiography, and gas chromatography. More l4C-ethephon remained in the treated leaf when applied in combination with endothall than when applied alone. These results suggest that the synergistic interaction between endothall and. ethephon can be attributed to transport inhibition thereby increasing the availability of ethylene for the abscission process.

Open Access

Abstract

Foliar applications at 3, 6, and 9 kg ai/ha of 10 plant growth inhibitors were evaluated on 2- to 3-year-old seedlings of green ash (Fraxinus pennsylvanica Marsh.) and silver maple (Acer saccharinum L.) under greenhouse conditions. Effective retardation or inhibition without terminal injury was obtained on silver maple with the high rates of ancymidol and MH and the low rate of fluoridamid. Ancymidol at 6 and 9 kg ai/ha, Krenite at 9 kg ai/ha and the combination, chlorflurenol + maleic hydrazide (MH) at 3 and 6 kg ai/ha, gave the best control of stem elongation on green ash without excessive injury.

Open Access