Composition and method for treating plants with exogenous...

A - Human Necessities – 01 – N

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A01N 25/30 (2006.01) A01N 25/04 (2006.01) A01N 25/28 (2006.01) A01N 35/06 (2006.01) A01N 37/22 (2006.01) A01N 37/40 (2006.01) A01N 41/04 (2006.01) A01N 43/40 (2006.01) A01N 43/50 (2006.01) A01N 47/24 (2006.01) A01N 47/36 (2006.01) A01N 57/20 (2006.01) G01N 21/84 (2006.01)

Patent

CA 2269725

A composition is disclosed for application to a plant that comprises a glyphosate or a herbicidal derivative thereof, an aqueous diluent, and a first excipient substance that is amphiphilic. The weight/weight ratio of the first excipient substance to the glyphosate or herbicidal derivative thereof is between about 1:3 and about 1:100. The aqueous composition forms anisotropic aggregates on a wax layer, and the presence of the anisotropic aggregates can be detected by a test described herein. Compositions of the present invention, when applied to plants, provide enhanced biological activity per unit amount of glyphosate or herbicidal derivative thereof, as compared to otherwise similar compositions containing surfactants that do not form anisotropic aggregates. Without being bound by theory, it is presently believed that this enhanced biological activity results from the formation or enlargement of hydrophilic channels through the epicuticular wax of the plant.

L'invention porte sur une composition à appliquer sur un végétal comprenant un substance chimique exogène (un herbicide de postlevée, par exemple), un diluant aqueux et un premier excipient amphiphile. La valeur du rapport pondéral du premier excipient à la substance chimique exogène est comprise entre environ 1/3 et environ 1/100. La composition aqueuse forme, sur une couche cireuse, des agrégats anisotropes dont on peut déceler la présence à l'aide d'un essai décrit dans le texte de cette invention. Une fois appliquées sur des végétaux, les compositions selon l'invention renforcent l'activité biologique par quantité unitaire de la substance chimique exogène par rapport à ce qu'il en est de compositions similaires contenant des tensioactifs ne formant pas d'agrégats anisotropes. Sans toutefois être esclave de cette théorie, il est actuellement raisonnable de croire que le renforcement de cette activité biologique est dû à la formation ou à l'accroissement de canaux hydrophiles dans la cire épicuticulaire du végétal.

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