Synergistic herbicidal compositions

A - Human Necessities – 01 – N

Patent

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Details

A01N 57/10 (2006.01) A01N 37/22 (2006.01)

Patent

CA 2204959

The present invention relates to compositions, having herbicidal synergistic effects, comprising (i) propanil; (ii) a compound of the formula Image (I) wherein R1 is alkyl, alkoxy, cycloalkyl, alkoxycarbonylalkyl or alkoxyalkyl; R2 and R3 are each independently alkyl, cycloalkyl or together with the oxygen atoms to which they are attached form a five or six membered heterocyclic ring containing the phosphorous atom; X is an oxygen or a sulfur atom; and Y is phenyl or phenyl substituted with up to three substituents independently selected from halogen atoms, nitro, cyano, alkyl, haloalkyl, alkoxy and haloalkoxy; or is thienyl or thienyl substituted with up to two substituentsindependently selected from halogen atoms and alkyl; and (iii) an agronomically acceptable carrier for the control of various grasses and broadleaf weeds in rice. More particularly, such compositions exhibit synergistic properties for selectively controlling weeds in rice, especially grassy weeds such as Barnyardgrass, Junglerice, Signalgrass andSprangletop. This invention also relates to a method of controlling weed species in rice comprising applying a herbicidally effective amount of a composition comprising (i) propanil, (ii) a compound of formula (1) and (iii) an agronomically acceptable carrier to the weed, to the locus of the weed or to the growth medium of said weed.

Compositions possédant des effets herbicides synergistes, renfermant : (i) du propanil; (ii) un composé de formule Image (I) où R1 est un groupe alkyle, alcoxy, cycloalkyle, alcoxycarbonylalkyle ou alcoxyalkyle; R2 et R3 sont chacun indépendamment l'un de l'autre un groupe alkyle, cycloalkyle, ou forment ensemble avec les atomes d'oxygène auxquels ils sont liés un hétérocycle à cinq ou six chaînons renfermant un atome de phosphore; X est un atome d'oxygène ou de soufre; Y est un phényle ou un phényle avec trois substituants ou moins, choisis parmi les atomes d'halogène et les groupes nitro, cyano, alkyle, haloalkyle, alcoxy et haloalcoxy, ou un thiényle ou thiényle avec deux substituants ou moins choisis indépendamment l'un de l'autre parmi les atomes d'halogènes et un alkyle; (iii) un véhicule acceptable en agriculture pour l'élimination de diverses herbes et de dicotylédones dans le riz. Plus spécifiquement, ces compositions possèdent des propriétés synergistes pour l'élimination sélective des mauvaises herbes dans le riz, notamment du pied-de-coq, d'Echinochloa colona, de Brachiaria et du scolochlée. L'invention porte également sur une méthode d'élimination de mauvaises herbes dans le riz, soit l'application d'une quantité herbicide efficace d'une composition renfermant (i) du propanil, (ii) un composé de formule (I) et (iii) un véhicule acceptable en agriculture, pour le transport de la composition jusqu'à la mauvaise herbe, à son emplacement ou à son milieu de culture.

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