| abstract |
Dihydropyrazoles of formula (I) wherein X is O or S; A is optionally substituted aryl; R<1> is hydrogen, optionally substituted alkyl, optionally substituted aryl or alkoxycarbonyl; R<2> is optionally substituted alkyl; R<3> is hydrogen, acyl, optionally substituted allyl, alkoxycarbonyl, a group -S(O)nR<5> as hereinafter defined or a group -NR<6>R<7> as hereinafter defined; and R<4> represents hydrogen or from 1 to 4 optional substitutents, are useful against insect and acarine pests. <IMAGE> |