ENHANCED HERBICIDE COMPOSITIONS

A concentrate herbicidal composition is provided comprising a first herbicide that is anionic, for example the herbicide glyphosate, and a second herbicide that elicits a visible symptom of phytotoxicity in a plant within about 4 days after application to foliage of the plant. The concentrate composition further comprises (a) an alkylether surfactant component consisting of one or more surfactants each having the formula R12-O-(CH2CH2O)n((CHR)20)m R13 wherein R12 is an aliphatic saturated or unsaturated hydrocarbyl group having about 16 to about 22 carbon atoms, n is an average number of about 5 to about 100, m is an average number of 0 to about 5, one R in each -((CHR)2O)- group is hydrogen and the other R is methyl, and R13 is a hydrogen, C1-4 alkyl or C2-4 acyl group; and (b) an amine surfactant component. The weight ratio of the alkylether surfactant component to the amine surfactant component is about 1:10 to about 10:1; and the alkylether and amine surfactant components are present in total in an adjuvant amount of about 0.05 to about 0.5 parts by weight per part by weight of the first herbicide, expressed as acid equivalent. Also provided are a plant treatment composition comprising a first herbicide, a second herbicide, an alkylether surfactant component and an amine surfactant component, all as described above, dissolved or dispersed in water, and a herbicidal method comprising applying such a plant treatment composition to foliage of a plant. L'invention concerne une composition herbicide concentrée qui comprend un premier herbicide anionique, par exemple le glyphosate herbicide, et un deuxième herbicide qui provoque un symptôme visible de phytotoxicité chez une plante dans les quatre jours environ qui suivent son application au feuillage de la plante. La composition concentrée comprend en outre (a) un composant de surfactant à base d'éther d'alkyle constitué d'un ou de plusieurs surfactants dont chacun correspond à la formule: R -O-(CH2CH2O)n((CHR)2O)m-R dans laquelle R12 est un groupe hydrocarbyle saturé ou insaturé possédant entre environ 16 et environ 22 atomes de carbone, n est un nombre moyen entre environ 5 et environ 100, m est un nombre moyen entre environ 0 et environ 5, un R dans chaque groupe ((CHR)2O)- est hydrogène et l'autre R est méthyle et R13 est hydrogène, groupe alkyle C1-4 ou acyle C2-4; et (b) un composant de surfactant aminé. Le rapport pondéral du surfactant à base d'éther d'alkyle et du composant de surfactant aminé est e