Pesticidal naphthoquinone derivatives

摘要

Naphthoquinone derivatives of the general formula I in which R represents a hydrogen atom or a hydroxyl or an ethanoyloxy group are useful as pesticides, such as fungicides and, especially, insecticides and acaricides. Compounds of the formula I may be extracted from plants of the genus Calceolaria. The compound of formula I in which R is a hydrogen atom is a novel compound.