Department of Natural Science, Baruch College, New York, NY.
Department of Biology, Queens College, Flushing, NY.
J Econ Entomol. 2021 Feb 9;114(1):320-325. doi: 10.1093/jee/toaa274.
Eastern New York State is frequently the site of Colorado potato beetle (Leptinotarsa decemlineata, Say) populations with the highest observed levels of insecticide resistance to a range of active ingredients. The dominance of a resistant phenotype will affect its rate of increase and the potential for management. On organic farms on Long Island, L. decemlineata evolved high levels of resistance to spinosad in a short period of time and that resistance has spread across the eastern part of the Island. Resistance has also emerged in other parts of the country as well. To clarify the level of dominance or recessiveness of spinosad resistance in different parts of the United States and how resistance differs in separate beetle populations, we sampled in 2010 beetle populations from Maine, Michigan, and Long Island. In addition, a highly resistant Long Island population was assessed in 2012. All populations were hybridized with a laboratory-susceptible strain to determine dominance. None of the populations sampled in 2010 were significantly different from additive resistance, but the Long Island population sampled in 2012 was not significantly different from fully recessive. Recessive inheritance of high-level resistance may help manage its increase.
纽约州东部经常是科罗拉多马铃薯甲虫（Leptinotarsa decemlineata，Say）种群的所在地，这些种群对一系列活性成分的杀虫剂抗性水平最高。抗性表型的优势将影响其增长率和管理潜力。在长岛的有机农场，L. decemlineata 在短时间内对多杀菌素产生了高水平的抗性，这种抗性已经蔓延到了岛的东部。这种抗性也在该国其他地区出现。为了阐明美国不同地区多杀菌素抗性的显性或隐性程度，以及不同甲虫种群的抗性有何不同，我们于 2010 年在缅因州、密歇根州和长岛采样了甲虫种群。此外，2012 年还评估了一个高度耐药的长岛种群。所有种群都与实验室敏感菌株杂交以确定显性。2010 年采样的种群中没有一个与加性抗性有显著差异，但 2012 年采样的长岛种群与完全隐性差异不显著。高水平抗性的隐性遗传可能有助于控制其增长。
