15 novel diacylhydrazine derivatives containing furan were synthesized by the reaction of 5-(ortho-, meta- or para-Cl) substituted benzoyl-2-furancarbonyl chloride with substituted benzohy-drazide in anhydrous dichloromethane under reflux. Their structures were confirmed by IR, ¹H NMR spectra and elemental analysis. The preliminary bioassay showed that some title compounds exhibit good or moderate larvicidal activity to the Mythimna separata and induce a premature, abnormal, and lethal larval molt. At the concentration of 0.1%, compounds Io and Ij showed respectively 85% and 55% larvicidal activities to armyworm (Mythimna separate). Most of the title compounds showed lower activity to the Aphis fabae and Tetranchus urticae at the concentration of 0.05%.

Key words: diacylhydrazine, furan, ecdysis, insect growth regulator