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Temperature Impact on Telenomus podisi Emergence in Field Releases of Unprotected and Encapsulated Parasitoid Pupae
Neotropical Entomology ( IF 1.8 ) Pub Date : 2021-03-10 , DOI: 10.1007/s13744-021-00857-3
Érica Caroline Braz 1 , Adeney de Freitas Bueno 2 , Fernanda Caroline Colombo 3 , Ana Paula de Queiroz 4
Affiliation  

This work aimed to evaluate the influence of temperature on the emergence of Telenomus podisi throughout the soybean development cycle, using encapsulated and unprotected pupae releases, in four different possible locations where pupae can be deposited during release. The trial was carried out in a randomized block design in a 2 × 4 factorial scheme: two parasitoid pupae release strategies (encapsulated and unprotected) × four pupae locations (between soybean lines of planting, bottom third, middle third, or upper third of plant canopy) with 5 replicates. There were no significant interactions between the studied factors. In the vegetative stage (V2 and V9), a smaller percentage of emergence of parasitoid adults was observed between soybean lines of planting (37.1% and 23.4% for V2 and V9 , respectively). The highest maximum temperatures were recorded between the soybean lines, with the greatest variations in maximum and minimum temperatures (55.2°C and 21.3°C) in V2 and (52.8°C and 23.9°C) in V9. In the reproductive stages (R1, R4, and R7), the observed temperatures were lower when compared to those observed in the vegetative stages (V2 and V9), with no difference in the emergence of parasitoid adults, which was above 70% in stage R1 and above 80% in R4 and R7. Regarding the pupae (encapsulated or unprotected), both allowed similar adult emergence. Therefore, it can be concluded that both unprotected and encapsulated pupae can be released, but those releases during the soybean vegetative development stage should be avoided due to the high temperatures to which pupae can be exposed.



中文翻译:

温度对无保护和包裹的寄生蜂蛹的田间释放中的Telenomus podisi 出现的影响

这项工作旨在评估温度在整个大豆发育周期中对Telenomus podisi出现的影响,使用封装和未受保护的蛹释放,在释放过程中可以在四个不同的可能位置放置蛹。该试验以 2 × 4 因子方案的随机区组设计进行:两种寄生蜂蛹释放策略(封装和未保护)×四个蛹位置(种植大豆品系之间,植物底部三分之一、中间三分之一或上部三分之一冠层),重复 5 次。研究的因素之间没有显着的相互作用。在营养阶段(V 2和 V 9),在种植大豆品系之间观察到较小比例的寄生蜂成虫(V 2和V 9分别为37.1%和23.4% )。最高温度记录在大豆品系之间,最高和最低温度(55.2°C 和 21.3°C)在 V 2和(52.8°C 和 23.9°C)在 V 9 变化最大。在生殖阶段(R 1、R 4和R 7),观察到的温度与营养阶段(V 2和V 9)相比较低,寄生成虫的出现没有差异,这是R 1阶段超过 70%R 4和R 7超过80% 。关于蛹(有囊膜或无保护),两者都允许类似的成虫出现。因此,可以得出结论,未受保护的和有囊膜的蛹都可以释放,但由于蛹可能暴露在高温下,因此应避免在大豆营养发育阶段释放。

更新日期:2021-03-11
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