Population dynamics of Heliothis virescens (F.) (Lepidoptera: Noctuidae) in a host-species rich agroecosystem: Implications for insecticide resistance management 机翻标题: 暂无翻译,请尝试点击翻译按钮。

作者
Abney, Mark Ray
摘要
A three-year evaluation of crop host utilization by the tobacco budworm, Heliothis virescens (F.), was conducted from 2001 to 2003 in the central coastal plain of North Carolina. Weekly monitoring of commercial tobacco and non-Bt cotton fields revealed spatial and temporal patterns of host use, but showed that tobacco budworm may be produced in tobacco throughout the growing season. Small plot trials conducted in 2002 and 2003 demonstrated a strong oviposition preference of tobacco budworm for tobacco when located adjacent to plantings of alternate crop hosts. Moths collected in pheromone traps placed up to a quarter mile from primary sources of tobacco budworm production demonstrate sufficient short-range movement by adult insects to facilitate mating of individuals produced in distant cotton and tobacco fields. The bodies of individual moths were analyzed for the presence of a cotton-specific analyte, gossypol, using high-pressure liquid chromatography-mass spectrometry/mass spectrometry (HPLC-MSMS). In a validation study, 100% of moths reared in the laboratory on cotton tested positive for the presence of gossypol, while 81% of moths reared on non-cotton hosts were determined to be negative for gossypol. This technique provides a conservative estimate of tobacco budworm production on hosts other than cotton. Analysis of feral moths revealed that <10% of tobacco budworms collected in pheromone traps in the central coastal plain of North Carolina contained gossypol. Isotope ratio mass spectrometry (IRMS) analysis of 13C/ 12C ratios of moths reared on four crop-plant species and two common weed species revealed a range of δ13C values within that expected for plants utilizing the C3 photosynthetic pathway. No significant differences in mean δ13C values were detected between moths reared on any of the host plant species. Vegetative and reproductive tissues from potential host plants utilized in the study also could not be separated to species. Feral tobacco budworm moths collected over three years were found to have carbon isotope ratios consistent with those having fed on C3 plants. The average δ13C value of feral insects collected within a single year appeared to be closely associated with the total accumulated rainfall for the months May through August. Results demonstrate that within the range of C3 host plants tested, no unique carbon isotope signature exists that would enable a reliable determination of natal origin of feral tobacco budworm with current IRMS technology. (Abstract shortened by UMI.)
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关键词
Entomology;Plant propagation
页数
117
出版日期
2019-06-25
学位授予单位
North Carolina State University
学位年度
2005
学位
Ph.D.
语言
eng
院系
Entomology;Plant propagation
导师
Sorenson, Clyde E.
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