摘要 |
In a synergistic pesticidal composition comprising (1) a pesticidally active compound and (2) a synergizing agent in amount sufficient to synergize the pesticidal activity of the pesticidally active compound, the improvement which comprises employing as the synergizing agent a 2-(thi)oxo-1,3,2-oxazaphospholane of the formula <IMAGE> in which X represents oxygen or sulphur, R represents an optionally substituted alkyl, alkenyl, alkynyl, phenyl, alkoxy, alkenoxy, alkynoxy, alkylthio, aralkoxy, amino, mono- or di-alkylamino, heterocyclic amino, N-alkyl-N-aryl-amino, phenoxy or phenylthio radical, R1 represents hydrogen, optionally substituted alkyl, aralkyl, alkenyl, alkynyl or dialkylaminoalkyl, R2 represents hydrogen, alkylthioalkyl, or optionally substituted alkyl or aralkyl, or R1 and R2 together represent alkylene, R3 represents hydrogen or alkyl and R4 represents hydrogen, alkyl, or phenyl.
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