Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, Valencia, Spain.
Pest Manag Sci. 2024 Dec;80(12):6375-6388. doi: 10.1002/ps.8366. Epub 2024 Aug 16.
Eutetranychus banksi (McGregor) (Acari: Tetranychidae) is an invasive spider mite native to the Americas. In 2013 it invaded the main citrus-growing area in Spain producing significant damage and requiring chemical treatments. This work examines its population structure, spatial distribution and presents a sampling plan, which will assist in developing an integrated pest management (IPM) strategy.
There were differences in the population structure on fruits and leaves, as well as between leaves from different flushes with fluctuations over time correlated with variations in sex ratio. No differences in aggregation at the different plant strata were found; however, immature stages showed a higher aggregation than adults, with females being the sex with the lowest aggregation. There was a high correlation between E. banksi motile forms and adult females with the total population, thus both were used as reference stages to develop sampling plans. We recommend binomial sampling of 100 leaves for female monitoring, sampling two leaves per tree on 25 trees per transect regularly spaced along two diagonal transects, the first oriented northeast to southwest and the second northwest to southeast. To be more accurate, it is possible to survey the presence/absence of motile forms. In this case, four leaves per tree in 50 trees per transect should be monitored.
This study has resulted in the first sampling plan for E. banksi, one of the most damaging citrus mite species described so far. The binomial sampling plan involves monitoring reference developmental stages, as well as a reasonable sample size that makes it applicable in field sampling for decisions making based on a future intervention threshold. © 2024 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
巴氏钝绥螨（McGregor）（蜱螨目：叶螨科）是一种原产于美洲的入侵性蜘蛛螨。2013 年，它入侵了西班牙主要的柑橘种植区，造成了重大损害，并需要进行化学处理。本研究考察了其种群结构、空间分布，并提出了一个抽样方案，这将有助于制定综合虫害管理（IPM）策略。
果实和叶片上的种群结构以及不同新梢叶片之间存在差异，随着时间的推移，性别比例的变化与种群结构的波动相关。不同植物层间未发现聚集差异；然而，未成熟阶段的聚集程度高于成虫，雌性的聚集程度最低。移动形式的巴氏钝绥螨与成虫和总种群之间存在高度相关性，因此两者都被用作参考阶段来制定抽样计划。我们建议采用二项抽样法，对 100 片叶片进行雌性监测，在每条对角线样带上每隔 25 株树随机抽取两片叶片，样带应分别沿东北至西南和西北至东南方向排列。为了更准确地调查移动形式的存在/不存在情况，可以采用四叶抽样法，对 50 株树中的每株树进行监测。
本研究制定了巴氏钝绥螨的首个抽样计划，巴氏钝绥螨是迄今为止描述的最具破坏性的柑橘螨类之一。二项抽样计划涉及监测参考发育阶段，以及合理的样本量，这使得它适用于基于未来干预阈值的现场抽样决策。
