期刊
JOURNAL OF ECONOMIC ENTOMOLOGY
卷 108, 期 4, 页码 1624-1629出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jee/tov150
关键词
phosphine; Bactrocera correcta; exposure time; synergistic effect; mortality
类别
资金
- Chinese Academy of Inspection and Quarantine
- Chinese Academy of Inspection and Quarantine [2014JK024, 2015JK007]
- Key Projects in the National Science and Technology Pillar Program During the Twelfth Five-Year Plan Period [2015BAD08B02]
This laboratory-based study examined the effects of low-temperature phosphine fumigation on the survival of the eggs and larvae of the guava fruit fly, Bactrocera correcta (Bezzi). Individual flies at different developmental stages, from 6-h-old eggs to third instars, were exposed to 0.92 mg/liter phosphine for 1-7 d at 5 degrees C. We found that 12-h-old eggs and third instars were the most tolerant to phosphine. Increasing phosphine concentrations from 0.46 to 4.56 mg/liter increased mortality in these two stages. However, increased exposure times were required to achieve equal mortality rates in 12-h-old eggs and third instars when phosphine concentrations were >= 4.56 and >= 3.65 mg/liter, respectively. C(n)t = k expression was obtained at 50, 90, and 99% mortality levels, and the toxicity index (n) ranged from 0.43 to 0.77 for the two stages. The synergistic effects of a controlled atmosphere (CA) with elevated CO2 levels were also investigated, and we found that a CO2 concentration between 10% and 15% under CA conditions was optimal for low-temperature phosphine fumigation.
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