Carmona Gabriela Inveninato, Robinson Emily, Campos Julia Nogueira Duarte, McMechan Anthony Justin
Department of Entomology, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
Department of Statistics, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
Insects. 2022 Mar 31;13(4):348. doi: 10.3390/insects13040348.
Cover crops provide a habitat for pests and beneficial arthropods. Unexpected pest pressure in a cover-crop-to-corn system can occur and result in increased use of insecticides. Eight site-years of on-farm field studies were conducted in 2019, 2020, and 2021. The objective of the study was to evaluate the impact of insecticide timing relative to cover-crop termination on arthropod activity in a cover-crop-to-corn system. The treatments consisted of (i) glyphosate to terminate the cover crop, (ii) glyphosate and pyrethroid tank mix to terminate the cover crop, and (iii) glyphosate to terminate the cover crop and pyrethroid application 25 days after the termination. Arthropod activity was measured with pitfall traps before and at each treatment application. A total of 33,316 arthropods were collected. Total arthropods, Collembola, and Aphididae were the only taxa reduced with an insecticide application. The other arthropod taxa were mainly influenced by the sampling period. No significant pest pressure occurred at any site-year. Insecticide applications are not generally needed in a cover-crop-to-corn system. Scouting for pests and applying strategies only when necessary is crucial to conserve potentially beneficial arthropods in the system.
覆盖作物为生害虫和有益节肢动物提供了栖息地。在覆盖作物 - 玉米系统中可能会出现意外的害虫压力，从而导致杀虫剂使用量增加。2019年、2020年和2021年进行了八年次的农场实地研究。该研究的目的是评估相对于覆盖作物终止时间的杀虫剂施用时间对覆盖作物 - 玉米系统中节肢动物活动的影响。处理措施包括：（i）使用草甘膦终止覆盖作物；（ii）草甘膦与拟除虫菊酯混合液终止覆盖作物；（iii）使用草甘膦终止覆盖作物，并在终止后25天施用拟除虫菊酯。在每次处理施用前及施用时，用陷阱诱捕器测量节肢动物的活动情况。共收集到33316只节肢动物。施用杀虫剂后，只有总节肢动物、弹尾目和蚜科数量减少。其他节肢动物类群主要受采样时期的影响。在任何年份的任何地点都未出现显著的害虫压力。在覆盖作物 - 玉米系统中，一般不需要施用杀虫剂。对害虫进行监测并仅在必要时采取防治策略，对于保护该系统中潜在的有益节肢动物至关重要。
