1. This work aimed to assess the potential of Geissospermum argenteum Woodson (Apocynaceae) as a reservoir of fruit fly (Diptera: Tephritidae) parasitoids (Hymenoptera) in an upland forest in Brazil.
2. The study was conducted in a remnant of primary upland forest, in which were distributed 10 plots (0.5 ha each). All individuals of G. argenteum with diameters greater than 5 cm at a height of 1.3 m were inventoried. Two trees per plot were selected to assess the total production of fruit. Collectors were installed under the canopy projection of each tree. The fruits were counted and weighed in the field and were transported to the laboratory, to determine the dry mass. Samples of fruits were collected to investigate their infestation by fruit flies and percentage of parasitism.
3. A total of 394 specimens of G. argenteum were identified in the 5 ha investigated area, of which only 126 produced fruits during the 12 months of the assessment. Production ranged from 59 to 2478 fruits per plant (0.59 and 19.73 kg of fresh mass, respectively). Fifty-nine fruit samples were collected from 44 plants, from which 7703 puparia were obtained. Only Anastrepha atrigona Hendel emerged from the puparia. The mean infestation rate was 554.9 puparia/kg of fruit (0.4–1628.6 puparia/kg). Four species of parasitoids were obtained, with mean percentage of parasitism of 2.27% (0.23–9.01%).
4. Our results show that G. argenteum is a reservoir of fruit fly parasitoids, highlighting the importance of its conservation in native habitats, as well as its multiplication in areas close to commercial orchards.

中文翻译：

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Geissospermum argenteum（被子植物：夹竹桃科）：巴西亚马逊山地森林中的果蝇（双翅目：实蝇科）寄生蜂库

1. 这项工作旨在评估Geissospermum argenteum Woodson（夹竹桃科）作为巴西高地森林中果蝇（双翅目：实蝇科）寄生蜂（膜翅目）的宿主的潜力。
2. 该研究是在原始山地森林的残余中进行的，其中分布有 10 个地块（每个地块 0.5 公顷）。对所有直径大于 5 cm、高度 1.3 m的G. argenteum个体进行清点。每块地选择两棵树来评估水果的总产量。收集器安装在每棵树的树冠投影下。在田间对果实进行计数和称重，运至实验室，测定干重。收集水果样品以研究它们被果蝇侵染和寄生的百分比。
3. 在 5 公顷的调查区域共鉴定了 394 个G. argenteum标本，其中在 12 个月的评估中只有 126 个产生了果实。每株植物的产量范围为 59 到 2478 个果实（分别为 0.59 和 19.73 千克鲜重）。从44株植物中收集了59个果实样品，从中获得了7703个蛹。只有Anastrepha atrigona Hendel从蛹中出现。平均侵染率为 554.9 puparia/kg 果实（0.4–1628.6 puparia/kg）。获得了四种寄生蜂，寄生的平均百分比为 2.27% (0.23-9.01%)。
4. 我们的结果表明G. argenteum是果蝇寄生蜂的储存库，突出了其在原生栖息地保护以及在靠近商业果园的地区繁殖的重要性。