ABSTRACT

The host-searching capacity of the parasitoid Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae) was evaluated in field cages with Anastrepha ludens (Loew)-infested mangoes. The main objective was to determine whether the data collected from these evaluations could be analysed to obtain useful quality indicators of mass reared adult parasitoids. Landing and oviposition activities of female parasitoids on infested fruit increased at higher densities of larvae and with more extended time of infested fruit exposition. Physical characteristics of the fruits did not influence the search. Females positively arrested on infested fruit, and their response was significantly related to the number of larvae per fruit. At a density of 1–40 larvae per fruit, 5–8 parasitoid females were found landing on the fruit, with 1–2 females ovipositing every 15 minutes for 2 hours, resulting in percentages of parasitism between 30 and 56%. The mass-reared parasitoids showed a competitive response similar to that determined for wild parasitoids. The evaluation procedure is practical and inexpensive, allowing it to be applied for quality assessment in mass rearing of D. longicaudata.

摘要

在具有实心实蝇的田间笼子中评估了寄生蜂Diachasmimorpha longicaudata (Ashmead)（膜翅目：茧蜂科）的宿主搜索能力(Loew)-出没的芒果。主要目的是确定是否可以分析从这些评估中收集的数据，以获得大规模饲养的成虫的有用质量指标。雌性寄生蜂在受侵染果实上的着陆和产卵活动随着幼虫密度的增加和受侵染果实暴露时间的延长而增加。水果的物理特性不影响搜索。雌性对受侵染的果实采取积极的行动，它们的反应与每个果实的幼虫数量显着相关。在每个果实 1-40 只幼虫的密度下，发现 5-8 只雌性寄生蜂落在果实上，2 小时内每 15 分钟有 1-2 只雌性寄生，导致寄生百分比在 30% 到 56% 之间。大规模饲养的寄生蜂表现出与野生寄生蜂相似的竞争反应。评估程序实用且成本低廉，可用于大规模饲养的质量评估D. 长尾数据。