PCT No. PCT/GB95/00953 Sec. 371 Date Aug. 9, 1995 Sec. 102(e) Date Aug. 9, 1995 PCT Filed Apr. 26, 1995 PCT Pub. No. WO95/32176 PCT Pub. Date Nov. 30, 1995The invention relates to certain naphthoquinone derivatives, some of which are novel, of the general formula I (I) in which R represents a hydrogen atom or a hydroxyl or an ethanoyloxy group; methods for their preparation; compositions containing such compounds and their use as pesticides, such as fungicides and, especially, insecticides and acaricides. Compounds of formula I may be derived from plants of the genus Calceolaria and the invention therefore also relates to extracts of a Calceolaria species and their use as pesticides.
