Instituto de Investigaciones Agropecuarias y Forestales, Universidad Michoacana de San Nicolás de Hidalgo, Km. 9.5 Carretera Morelia-Zinapécuaro, 58880, Tarímbaro, Michoacán, Mexico.
Ingeniería en Procesos Agroalimentarios, Universidades para el Bienestar Benito Juárez García, Áporo, Michoacán, Mexico.
Environ Sci Pollut Res Int. 2020 Jun;27(16):19473-19483. doi: 10.1007/s11356-020-08475-z. Epub 2020 Mar 25.
The ectoparasitoid Tamarixia triozae is a promising biological control agent of the tomato psyllid, Bactericera cockerelli, based on its high parasitism rates on different crops. The parasitism, host feeding, and transgenerational effects (in terms of sex ratio) of T. triozae females exposed to three insecticides (soybean oil, imidacloprid, and abamectin) as eggs, larvae, and pupae were evaluated when a mixture of second, third, fourth, and fifth instars of the host B. cockerelli was offered. The concentrations bioassayed of each insecticide corresponded to the minimum field-registered concentration [MiFRC] and one-half the MiFRC. No parasitism of B. cockerelli second instars was recorded when parasitoid's females were exposed in any of the three immature stages to any of the insecticides. In contrast, in some cases, parasitism of T. triozae females treated as eggs, larvae, or pupae with soybean oil and imidacloprid was reduced in third, fourth, or fifth instar. In most cases, the host feeding was reduced in second and third instar of the host B. cockerelli when T. triozae females were treated as eggs, larvae, or pupae. Any insecticide modified the sex ratio in the F2 generation. In conclusion, both parasitism and host feeding were affected by the insecticides depending on the concentration and on the nymphal instar of the host B. cockerelli offered.
外寄生性姬小蜂 Tamarixia triozae 是番茄斑潜蝇 Bactericera cockerelli 的一种很有前途的生物防治剂，这基于其对不同作物的高寄生率。当提供第二、三、四和五龄期混合的宿主 B. cockerelli 若虫时，评估了暴露于三种杀虫剂（大豆油、吡虫啉和阿维菌素）作为卵、幼虫和蛹的 T. triozae 雌蜂的寄生率、取食行为和世代间效应（以性别比例衡量）。每种杀虫剂的测试浓度均对应最低田间登记浓度 [MiFRC] 和 MiFRC 的一半。当寄生蜂的雌蜂在任何三个未成熟阶段暴露于任何一种杀虫剂时，都未记录到对 B. cockerelli 第二龄幼虫的寄生。相比之下，在某些情况下，用大豆油和吡虫啉处理的 T. triozae 雌蜂的卵、幼虫或蛹的寄生率在第三、第四或第五龄期降低。在大多数情况下，当 T. triozae 雌蜂作为卵、幼虫或蛹处理时，会降低第二和第三龄期宿主 B. cockerelli 的取食行为。任何杀虫剂都会改变 F2 代的性别比例。总之，寄生和取食行为都受到杀虫剂的影响，这取决于浓度和提供的宿主 B. cockerelli 的若虫龄期。
