Tarsonemus bakeri Ewing (Acari: Tarsonemidae) is a species of mite commonly associated with citrus in many countries including the United States. A short report in 1942 suggested this species is phytophagous, but it has not been reported as a pest in citrus or any other crop since then. A single survey of 78 orchards in three growing regions in California demonstrated that Tarsonemus spp. mites were only associated with leaf samples that had visible sooty mold. A seasonal population study in one citrus orchard showed that all life stages of Tarsonemus spp. were present year-round on leaves and fruit, with the population on fruit reaching a peak in December (59.7 ± 15.2 mites per fruit). Results from a food suitability study showed that the population declined sharply on both plastic and leaf substrate when the mites were not provided a supplementary food source. When supplementary food was provided in the form of Alternaria, honeydew, molasses, or combinations of these, mites survived and multiplied throughout the 29-d study, irrespective of the substrate. Tarsonemus bakeri were found on excised, decaying leaves collected from an orchard. These studies verify that Tarsonemus spp. are associated only with sooty mold in citrus orchards. T. bakeri populations cannot sustain themselves on leaf tissue alone, indicating that they are nondamaging to citrus and therefore need not be considered a phytosanitary concern by importing countries.

中文翻译：

---

Tarsonemus spp的田间生态学和食物适宜性。（螨类：螈科）

Tarsonemus bakeri Ewing (Acari: Tarsonemidae) 是一种螨虫，在包括美国在内的许多国家通常与柑橘相关。1942 年的一份简短报告表明该物种是植食性的，但从那时起，它就没有被报道为柑橘或任何其他作物的害虫。对加利福尼亚州三个种植区的 78 个果园进行的一次调查表明，Tarsonemus spp。螨虫仅与具有可见煤烟霉菌的叶子样本有关。在一个柑橘园进行的季节性种群研究表明，Tarsonemus spp 的所有生命阶段。全年都在叶子和果实上存在，果实上的数量在 12 月达到高峰（每个果实 59.7 ± 15.2 螨）。食物适宜性研究的结果表明，当螨虫没有提供补充食物来源时，塑料和叶子基质的种群数量急剧下降。当以链格孢、蜜露、糖蜜或它们的组合形式提供补充食物时，螨虫在整个 29 天的研究中存活并繁殖，无论基质如何。Tarsonemus bakeri 在从果园收集的切下腐烂的叶子上被发现。这些研究证实 Tarsonemus spp。仅与柑橘园中的烟灰霉有关。T. bakeri 种群仅靠叶子组织无法维持生存，这表明它们对柑橘无害，因此进口国不必将其视为植物检疫问题。或这些的组合，螨虫在整个 29 天的研究中存活并繁殖，与基质无关。Tarsonemus bakeri 在从果园收集的切下腐烂的叶子上被发现。这些研究证实 Tarsonemus spp。仅与柑橘园中的烟灰霉有关。T. bakeri 种群仅靠叶子组织无法维持生存，这表明它们对柑橘无害，因此进口国不必将其视为植物检疫问题。或这些的组合，螨虫在整个 29 天的研究中存活并繁殖，与基质无关。Tarsonemus bakeri 在从果园收集的切下腐烂的叶子上被发现。这些研究证实 Tarsonemus spp。仅与柑橘园中的烟灰霉有关。T. bakeri 种群仅靠叶子组织无法维持生存，这表明它们对柑橘无害，因此进口国不必将其视为植物检疫问题。