| 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 syngerizing 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-alky-N-aryl-amino, phenoxy or phenylthio radical, R1 represents hydrogen, optionally subsituted 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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