Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Liviidae), is the vector of the bacterium Candidatus Liberibacter sp., a quarantine pathogen in citrus production areas such as Australia, Europe, and northeast Brazil, associated with huanglongbing (HLB). The psyllids’ preferred host is Murraya paniculata (L.) Jacq. (Rutaceae), an ornamental plant native to Asia and Oceania, and commonly found in urban areas next to citrus groves around the world. As there are insecticide application restrictions for urban areas, monitoring and use of biological control to suppress ACP are essential for an area‐wide HLB management strategy, especially for production areas predominantly composed of small citrus farms. For this, it is necessary to understand the occurrence cycles of ACP and vegetative flush of the ornamental host. This study characterized the occurrence cycles of M. paniculata flush shoot and accumulated rainfall, and the association with ACP presence (proportion of monitored trees) and abundance (per tree) in a Brazilian urban area free of HLB. A 3‐year time series was constructed using spectral and co‐spectral analysis. Spectral analysis showed the occurrence of at least seven flush shoot cycles of M. paniculata, nearly 10 ACP presence and abundance cycles, and monthly cycles of accumulated rainfall. Cycles of ACP presence were associated with ACP abundance, with ACP presence cycles occurring around 7 days before ACP abundance cycles and the correlation and co‐spectral analyses indicated an almost simultaneous occurrence of the main cycles of M. paniculata flush shoots and ACP occurrence. These findings will facilitate the development of an ACP biological control program based on parasitoid releases in urban areas in HLB‐free citrus groves.

中文翻译：

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巴西无黄龙病城市地区Murraya paniculata中柑橘木虱的存在和丰度

亚洲柑橘木虱（ACP），柑橘木虱（半翅目：Liviidae）是自由假丝酵母菌（Candidatus Liberibacter sp.）的载体，该细菌是澳大利亚、欧洲和巴西东北部等柑橘产区的检疫病原体，与黄龙病（HLB）相关. 木虱的首选宿主是 Murraya paniculata (L.) Jacq。（芸香科），一种原产于亚洲和大洋洲的观赏植物，常见于世界各地柑橘园附近的城市地区。由于城市地区存在杀虫剂应用限制，因此监测和使用生物防治来抑制 ACP 对于区域范围的 HLB 管理策略至关重要，尤其是对于主要由小型柑橘农场组成的生产区。为此，有必要了解 ACP 的发生周期和观赏寄主的营养性潮红。本研究描述了无 HLB 的巴西城市地区 M. paniculata 冲洗枝条和累积降雨的发生周期，以及与 ACP 存在（受监测树木的比例）和丰度（每棵树）的关联。使用光谱和共光谱分析构建了一个 3 年的时间序列。光谱分析表明，至少发生了 7 个 M. paniculata 的冲洗周期，近 10 个 ACP 存在和丰度周期，以及累积降雨量的月度周期。ACP 存在周期与 ACP 丰度相关，ACP 存在周期发生在 ACP 丰度周期前 7 天左右，相关性和共谱分析表明 M. paniculata 冲洗芽和 ACP 发生的主要周期几乎同时发生。