During our screening program for agrochemicals from Chinese medicinal herbs and wild plants, the essential oil of
Carum carvi fruits was found to possess strong contact toxicity against
Sitophilus zeamais and
Tribolium castaneum adults, with LD
50 values of 3.07 and 3.29 mg/adult,
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During our screening program for agrochemicals from Chinese medicinal herbs and wild plants, the essential oil of
Carum carvi fruits was found to possess strong contact toxicity against
Sitophilus zeamais and
Tribolium castaneum adults, with LD
50 values of 3.07 and 3.29 mg/adult, respectively, and also showed strong fumigant toxicity against the two grain storage insects with LC
50 values of 3.37 and 2.53 mg/L, respectively. The essential oil obtained by hydrodistillation was investigated by GC and GC-MS. The main components of the essential oil were identified to be (
R)-carvone (37.98%) and D-limonene (26.55%) followed by α-pinene (5.21),
cis-carveol (5.01%) and b-myrcene (4.67%). (
R)-Carvone and D-limonene were separated and purified by silica gel column chromatography and preparative thin layer chromatography, and further identified by means of physicochemical and spectrometric analysis. (
R)-Carvone and D-limonene showed strong contact toxicity against
S. zeamais (LD
50 = 2.79 and 29.86 mg/adult) and
T. castaneum (LD
50 = 2.64 and 20.14 mg/adult). (
R)-Carvone and D-limonene also possessed strong fumigant toxicity against
S. zeamais (LC
50 = 2.76 and 48.18 mg/L) and
T. castaneum adults (LC
50 = 1.96 and 19.10 mg/L).
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