Nonherbicidal Defoliants: I. Enhancement of Endothall/Ethephon with Surfactants.
Abstract
The study was designed to compare the effectiveness of several nonionic surfactants in enhancing defoliation of the bean (Phaseolus vulgaris L. cv. Red Kidney) when mixed with 7-oxabicylo (2.2.1) heptane, 2,3-dicarboxylic acid (endothall) and (2-chloroethyl)phosphonic acid (ethephon). Also, the defoliation dose-response of the bean and the white ash (Fraxinus americana L.) was determined for polyoxyethylene (20) sorbitan monolaurate (Tween 20) when mixed with endothall/ethephon. All surfactants enhanced the defoliation of the bean equally well at the 1.0% level. Bean plants showed increased defoliation with an increase in Tween 20 from 0.0625% to 1.0%. The white ash showed a nonlinear dose-response. The most effective level of Tween 20 was between 0.5% and 1.0% for both the bean and the white ash. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1973
- Accession Number
- AD0765484
Entities
People
- Gerald R. Leather
- John P. Sterrett
- William A. Tozer