Feeding deterrents from Dictamnus dasycarpus Turcz against two stored-product insects.
The screening for insecticidal principles from several Chinese medicinal herbs showed that the root bark of Dictamnus dasycarpus possessed significant feeding deterrence against two stored-product insects (Tribolium castaneum and Sitophilus zeamais). From the methanol extract, two feeding deterrents were isolated by bioassay-guided fractionation. The compounds were identified as fraxinellone and dictamnine from their spectroscopic data. Fraxinellone was demonstrated to possess feeding deterrent activity against adults and larvae of T. castaneum as well as S. zeamais adults with EC50 values of 36.4, 29.1, and 71.2 ppm, respectively. Dictamnine was shown to have feeding deterrent activity against adults and larvae of T. castaneum as well as S. zeamais adults with EC50 values of 57.6, 47.9, and 91.7 ppm, respectively.
Liu
Zhi Long
ZL
Department of Biological Sciences, National University of Singapore, Block S2, 14 Science Drive 4, Singapore 117543.
Xu
Yuan Jian
YJ
Wu
Jien
J
Goh
Swee Hock
SH
Ho
Shuit Hung
SH
D000470:Alkaloids / Q000302:isolation & purification / Q000494:pharmacology; D000818:Animals; D001572:Benzofurans / Q000302:isolation & purification / Q000494:pharmacology; D005591:Chemical Fractionation; D004435:Eating / Q000187:drug effects; D005506:Food Contamination / Q000517:prevention & control*; D007313:Insecta / Q000254:growth & development*; D007814:Larva / Q000254:growth & development; D010936:Plant Extracts / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D011804:Quinolines; D014231:Tribolium / Q000254:growth & development*
D000470:Alkaloids; D001572:Benzofurans; D010936:Plant Extracts; D011804:Quinolines; C075391:fraxinellone; C026398:dictamnine