In October 2013, Xylella fastidiosa subsp. pauca (Xfp) was reported as being associated with a decline of olive groves in Salento (Apulia, Italy) and named as “olive quick decline syndrome” (OQDS). Due to its quarantine status, a series of mandatory actions were established in the Apulia region to impede its further spread in the territory. Upon the demarcation of “containment” and “buffer” zones, monitoring surveys were carried out in these areas for sampling olive trees and other host plants that showed symptoms putatively attributable to OQDS. The eradication of plants that tested positive for Xfp, including also all the asymptomatic ones in a radius of 100 or 50 m, was performed over 10 years. An analysis, based on the official data of such surveillance activities over the period of a decade, was performed. The data show that the Xfp incidence in the “containment” and “buffer” zones is very low, especially during the last three campaigns from 2020–2021 to 2022–2023, when the bacterium was detected in a range of 0.06%–0.70% of the sampled plants. In most of the sampled trees that showed symptoms of OQDS, the bacterium was not detected. Based on these data and according to epidemiological models that verified the negligible role of asymptomatic olive trees in the spreading of OQDS, we propose to eliminate the rule requiring the uprooting of all host plants that surround one Xfp-positive tree in a radius of 50 m. Such an implementation could save many healthy centennial and monumental olive trees and the remarkable landscape that they contribute to.

中文翻译：

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十年来对木霉 (Xylella fastidiosa) 亚种的监测调查。普利亚（意大利）橄榄园中的 pauca 表明，划定区域内该细菌的发病率较低

2013 年 10 月，木霉(Xylella fastidiosa)亚种。据报道， pauca (Xfp) 与萨伦托（意大利普利亚）橄榄树林的衰退有关，并被命名为“橄榄快速衰退综合症”(OQDS)。由于其检疫状态，普利亚地区采取了一系列强制行动，以阻止其在该地区的进一步传播。在划定“遏制”区和“缓冲区”区后，在这些地区进行了监测调查，对表现出疑似 OQDS 症状的橄榄树和其他寄主植物进行取样。 Xfp 检测呈阳性的植物（包括半径 100 或 50 m 内的所有无症状植物）的根除工作历时 10 多年。根据十年来此类监视活动的官方数据进行了分析。数据显示，“遏制”区和“缓冲”区的 Xfp 发病率非常低，特别是在 2020-2021 年和 2022-2023 年的最后三个活动期间，检测到该细菌的范围为 0.06%-0.70%的样本植物。在大多数表现出 OQDS 症状的采样树木中，没有检测到这种细菌。基于这些数据，并根据证实无症状橄榄树在 OQDS 传播中的作用可以忽略不计的流行病学模型，我们建议取消要求将一棵 Xfp 阳性树周围 50 m 半径内的所有寄主植物连根拔起的规则。这样的实施可以拯救许多健康的百年和纪念性橄榄树以及它们所贡献的非凡景观。