Steinbach Denise, Moritz Gerald, Nauen Ralf
Department of Biology, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
Pest Control, R&D, CropScience Division, Bayer AG, Monheim, Germany.
Pest Manag Sci. 2017 Sep;73(9):1789-1797. doi: 10.1002/ps.4597. Epub 2017 Jun 6.
In many cases, resistance alleles have been associated with fitness costs and are often dependent on environmental factors such as temperature. Here, we studied the effects of temperature on the overall fitness, including development, survival and reproduction, of three insecticide-resistant and one susceptible strain of diamondback moth (DBM), Plutella xylostella (L.).
The broader cross-resistance profile of the resistant strains previously selected by diamide and benzoylurea insecticides was tested. Cohort studies were conducted in the laboratory at three different temperatures (20 ± 1 °C, 25 ± 1 °C and 30 ± 1 °C), and involved fitness costs were estimated. We observed significant differences in the development time, with the susceptible strain showing a shorter developmental period from egg stage to adult stage compared with the resistant strains. Moreover, the resistant strains differed significantly between one another. Additionally, the population growth parameters varied among the strains, with the benzoylurea-resistant strain showing the highest costs affecting the overall fitness of this strain. A temperature of 30 °C was unfavourable for DBM development, resulting in a reduced fitness in all strains.
Benzoylurea selection pressure on a diamide-resistant P. xylostella strain resulted in lowest reproduction parameters and the longest generation time, as well as doubling the time among all strains tested. This suggests significant effects on the overall fitness and population growth parameters for diamide-resistant populations pressured by benzoylureas under applied conditions. © 2017 Society of Chemical Industry.
在许多情况下,抗性等位基因与适合度代价相关,并且通常依赖于温度等环境因素。在此,我们研究了温度对小菜蛾(Plutella xylostella (L.))三种抗杀虫剂品系和一种敏感品系的整体适合度(包括发育、存活和繁殖)的影响。
测试了先前由双酰胺类和苯甲酰脲类杀虫剂筛选出的抗性品系更广泛的交互抗性谱。在实验室中于三种不同温度(20 ± 1 °C、25 ± 1 °C和30 ± 1 °C)下进行了群组研究,并估算了相关的适合度代价。我们观察到发育时间存在显著差异,敏感品系从卵期到成虫期的发育周期比抗性品系短。此外,抗性品系之间也存在显著差异。另外,各品系的种群增长参数有所不同,苯甲酰脲抗性品系显示出影响该品系整体适合度的最高代价。30 °C的温度不利于小菜蛾的发育,导致所有品系的适合度降低。
对双酰胺抗性小菜蛾品系施加苯甲酰脲选择压力导致繁殖参数最低、世代时间最长,并且在所有测试品系中时间翻倍。这表明在实际应用条件下,苯甲酰脲对双酰胺抗性种群的整体适合度和种群增长参数有显著影响。© 2017化学工业协会。