COMPARISON OF THE METABOLIC-FATE OF CARBARYL-NAPHTHYL-1-C-14 IN 2 BEETLE SPECIES (COLEOPTERA, SCOLYTIDAE)

Adult southern pine beetle, Dendroctonus frontalis Zimmermann, and spr uce beetle, Dendroctonus rufipennis (Kirby), were treated topically Wi th carbaryl-1-naphthyl-C-14, after which metabolism of the labeled che mical was studied. Methylolcarbaryl was the major metabolite in both b eetle species; its concentration reached 5.18% in internal extracts fr om southern pine beetle at 8 h and 1.21 and 3.58% in internal extracts from spruce beetle at 12 and 24 h, respectively. The southern pine be etle metabolized C-14-carbaryl and excreted its metabolites more quick ly than the spruce beetle. Other methanolic extractable metabolites we re tentatively identified from both species as 8-hydroxy-1-naphthyl me thylcarbamate, 5-hydroxy-1-naphthyl methylcarbamate, 1-naphthyl methyl carbamate, 1-naphthol, 1,4-naphthalenediol, and 1,5-naphthalenediol. S everal unidentified metabolites were also present.