J. Econ. Entomol. 104(4): 1445Ð1454

J. Econ. Entomol. 104(4): 1445Ð1454 (2011); DOI: 10.1603/EC11050
ABSTRACT The essential oils from rhizomes of Alpinia conchigera Griff, Zingiber zerumbet Smitt,
Curcuma zedoaria (Berg.) Roscoe; their major compounds (camphene, camphor, 1,8-cineole, -humulene,
isoborneol, -pinene, -pinene and terpinen-4-ol); and synthetic essential oils comprised of
mixtures of major pure compounds in the same ratios as the extracted essential oils were tested for
contact, feeding reduction, and repellency against Sitophilus zeamais Motschulsky and Tribolium
castaneum (Herbst) adults. Via topical applications, the three extracted oils had similar toxicity against
S. zeamais (LD50, Þducial limits: 18Ð24 g oil/mg insect). T. castaneum had similar sensitivity to all
three oils (35Ð58 g/mg), and it was less sensitive than S. zeamais. The LD50 values of synthetic A.
conchigera and synthetic Z. zerumbet oils were similar to those of their corresponding extracted
essential oils. The synthetic C. zedoaria oils showed lower contact toxicity than the extracted C.
zedoaria oils to both insects. Sitophilus zeamais and T. castaneum were sensitive to terpinen-4-ol and
isoborneol in contact toxicity tests. In antifeedant tests, the three extracted oils were able to decrease
the consumption of ßour disks, especially Z. zerumbet oils, whereas both insect species could feed on
the ßour disks treated with three synthetic essential oils. Only terpinen-4-ol deterred feeding in both
insects. In repellency tests, A. conchigera oils at highest concentration repelled S. zeamais and T.
castaneum. None of the synthetic essential oils repelled S. zeamais (315l/cm 2) and T. castaneum (31
l/cm 2). Only terpinen-4-ol showed repellent activity against both insects

ผลลัพธ์ (ไทย) 3:

ฉันต้องการ แต่ฉันลาดเทฉันต้องการ แต่ฉันลาดเทฉันต้องการ แต่ฉันลาดเทฉันต้องการ แต่ฉันลาดเทฉันต้องการ แต่ฉันลาดเท