บทคัดย่องานวิจัย

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Effects of oxygen, carbon dioxide, and temperature on the mortality responses of Epiphyas postvittana (Lepidoptera: Tortricidae).

Whiting, D.C., Foster, S. P., and Maindonald, J. H.

Journal of Economic Entomology. Volume 84, Number 5, Oct 1991, Pages 1544-1549.

1991

บทคัดย่อ

Effects of oxygen, carbon dioxide, and temperature on the mortality responses of Epiphyas postvittana (Lepidoptera: Tortricidae).

First-instar light brown apple moths, Epiphyas postvittana (Walker), were exposed to various controlled-atmosphere treatments at different temperatures. The time required for 99% mortality (LT99) was highly dependent on the concentration of O2 and temperature; insects died more rapidly with lower concentrations of O2 and with higher temperatures. The effect of different concentrations of CO2 on mortality of first instars was less pronounced. At 20 degrees C and an O2 concentration of 0.4%, a CO2 concentration of 5.0% resulted in lowest LT99 (mean of 22.5 h) of all of the CO2 concentrations tested. Using this atmosphere (i.e., 0.4% O2, 5.0% CO2), we determined mortality of third instars, fifth instars, and eggs of E. postvittana at 20 and 30 degrees C. At both temperatures, LT99s decreased in the following order: fifth instar > third instar approximately equal to eggs > first instar. An experiment testing this atmosphere at 40 degrees C on fifth instars gave a mean LT99 of 4.2 h.