当前位置: X-MOL 学术Am. J. Potato Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Comparison of Two Different Statistical Methods for Assessing Insecticide Efficacy in Small Plot Trials Targeting Wireworms, Limonius californicus (Mannerheim) (Coleoptera: Elateridae), in Potato
American Journal of Potato Research ( IF 1.5 ) Pub Date : 2019-12-02 , DOI: 10.1007/s12230-019-09748-1
Jeffrey A. Lojewski , Erik J. Wenninger

The efficacy of insecticides is often assessed in small-plot field trials that compare insect damage and yield loss relative to an untreated check, typically in a randomized complete block (RCB) design. When insect damage is not uniformly distributed across a field, differences among treatments might reflect differences in local pest pressure rather than differences in treatment efficacy. One potential way to account for patchy distributions is to use a “running check” in which each plot contains an insecticide treatment and its own untreated check. Any benefits of this approach must be weighed against the additional labor involved. Wireworms (Coleoptera: Elateridae) are soil-dwelling insects that typically exhibit patchy distributions that can confound insecticide efficacy trials. Several species of wireworms feed on potato tubers, causing damage that makes the tubers unmarketable and, aside from crop rotation, insecticides remain a cornerstone of wireworm management in potato. The current investigation evaluated insecticide efficacy trials targeting wireworms in potato by comparing two different analyses for the same data sets spanning five years and seven different studies. Data collected using the running check approach were analyzed using analysis of covariance and compared with analysis of variance as if the experiment were designed as a RCB. In a majority of cases, both methods resulted in similar levels of statistical power and similar conclusions; however, including data from the running check as a covariate did sometimes eliminate or reveal differences between treatments compared to ANOVA. Overall, given the similarity of the results and the additional labor involved in using running checks, the standard RCB design would have been appropriate for the experiments assessed here. However, for wireworms and other pests that exhibit patchy distributions, care must be taken when designing experiments and interpreting results.

中文翻译:

在马铃薯中针对线虫Limonius californicus(Mannerheim)(鞘翅目:Elateridae)进行小规模试验的两种评估杀虫效力的统计方法的比较

通常在小规模的田间试验中评估杀虫剂的功效,该试验比较未经处理的检查相对于昆虫的伤害和产量损失,通常是在随机完全块(RCB)设计中。如果昆虫的伤害在田间分布不均匀,则不同处理之间的差异可能反映了局部有害生物压力的差异,而不是处理功效的差异。解决斑片状分布的一种可能方法是使用“运行检查”,其中每个样地都包含杀虫剂处理和自己的未处理检查。必须权衡此方法的任何好处与所涉及的额外劳动。线虫(鞘翅目:Elateridae)是居住在土壤中的昆虫,通常表现出斑片状分布,可能使杀虫剂功效试验混淆。几种线虫以马铃薯块茎为食,造成的伤害使块茎无法销售,除轮作外,杀虫剂仍然是马铃薯线虫防治的基石。当前的研究通过比较五年中相同数据集的两个不同分析和七个不同研究,评估了针对马铃薯中线虫的杀虫剂功效试验。使用运行检查方法收集的数据使用协方差分析进行分析,并与方差分析进行比较,就好像该实验被设计为RCB。在大多数情况下,这两种方法得出的统计能力水平和结论相似。但是,将运行检查中的数据作为协变量包括在内,有时确实可以消除或揭示与ANOVA相比治疗之间的差异。总体,考虑到结果的相似性以及使用运行检查所涉及的额外人工,标准RCB设计将适合此处评估的实验。但是,对于表现出斑片状分布的线虫和其他害虫,在设计实验和解释结果时必须小心。
更新日期:2019-12-02
down
wechat
bug