Führ Fábio M, Ribeiro Arthur V, Menger James P, Koch Robert L
Department of Entomology, University of Minnesota, Saint Paul, MN, USA.
J Econ Entomol. 2024 Dec 28;117(6):2475-2483. doi: 10.1093/jee/toae249.
Macrosaccus morrisella (Fitch) (Lepidoptera: Gracillariidae) is a leaf-mining microlepidopteran native to North America recently reported feeding on soybean in the United States and Canada. Control methods for the management of this pest remain unknown. The insecticides Agri-Mek SC (abamectin) and Endigo ZXC (lambda-cyhalothrin + thiamethoxam) were evaluated for: (i) effects against immature stages of M. morrisella in potted soybean plants; (ii) effects against adults of M. morrisella through different routes of exposure; and (iii) efficacy of field applications against M. morrisella. In the experiment with immature stages, when either insecticide was applied to potted plants with M. morrisella in serpentine or blotch mines, significantly fewer adults emerged compared to the untreated plants. In contrast, adult emergence from potted plants treated with either insecticide when M. morrisella was in tentiform mines did not differ from untreated plants. In the experiment with adults, the survival of M. morrisella exposed to either insecticide through oral exposure or residual contact + oral exposure was significantly lower than that for residual contact exposure alone, which in turn was lower than the untreated control. Within each exposure route, the response to the 2 insecticides did not differ. In the field experiment, at 21 days after insecticide application, the mean percentage of leaf area mined was significantly lower in plots treated with Endigo ZCX compared to plots treated with Agri-Mek SC or those left untreated. These results suggest that Endigo ZXC and to a lesser extent Agri-Mek SC may have potential for management of M. morrisella.
莫里斯麦蛾（Fitch）（鳞翅目：细蛾科）是一种原产于北美的潜叶小鳞翅目昆虫，最近在美国和加拿大有其取食大豆的报道。针对这种害虫的防治方法仍不明确。对杀虫剂阿维菌素乳油（阿维菌素）和英迪戈ZXC（高效氯氟氰菊酯+噻虫嗪）进行了评估：（i）对盆栽大豆植株上莫里斯麦蛾未成熟阶段的防治效果；（ii）通过不同接触途径对莫里斯麦蛾成虫的防治效果；以及（iii）田间施药对莫里斯麦蛾的防治效果。在针对未成熟阶段的实验中，当将任何一种杀虫剂以蛇形或斑点状虫道施用于带有莫里斯麦蛾的盆栽植物时，与未处理的植株相比，羽化出的成虫显著减少。相比之下，当莫里斯麦蛾处于帐篷状虫道时，用任何一种杀虫剂处理的盆栽植物羽化出的成虫数量与未处理的植株没有差异。在针对成虫的实验中，通过口服接触或残留接触+口服接触方式接触任何一种杀虫剂的莫里斯麦蛾的存活率显著低于仅通过残留接触接触的存活率，而仅通过残留接触接触的存活率又低于未处理的对照。在每种接触途径内，对这两种杀虫剂的反应没有差异。在田间实验中，施药21天后，与用阿维菌素乳油处理的地块或未处理的地块相比，用英迪戈ZXC处理的地块上潜叶的平均叶面积百分比显著更低。这些结果表明英迪戈ZXC以及在较小程度上阿维菌素乳油可能具有防治莫里斯麦蛾的潜力。
