The alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae) is a major pest of alfalfa worldwide. In Spain, insecticide sprayings are mainly used for control with low efficacy. As a potential more sustainable control method, we determined the effectiveness of an alfalfa winter cutting for reducing pest populations in the spring and its interaction with parasitism rate due to Bathyplectes spp. (Hymenoptera: Ichneumonidae). Forty-two commercial fields were split in two parts and one was mowed during winter. Larval abundance in each part of the field was sampled by sweep netting in 2019 and 2020 before the first alfalfa spring cutting, when damage is caused. The rates of parasitism due to Bathyplectes anura (Thomson) and Bathyplectes curculionis (Thomson) were estimated by rearing larvae in the laboratory. Winter cutting significantly reduced the spring larval weevil populations and favored the rate of larval parasitism. Our results suggest that winter cutting can be a useful cultural method for alfalfa weevil control that has potential to be a component of an integrated pest management program.

苜蓿象鼻虫Hypera postica (Gyllenhal) (鞘翅目: Curculionidae) 是世界范围内苜蓿的主要害虫。在西班牙，杀虫剂喷洒主要用于防治效果不佳。作为一种潜在的更可持续的控制方法，我们确定了苜蓿冬季切割对减少春季害虫种群的有效性及其与由于Bathyplectes spp引起的寄生率的相互作用。（膜翅目：蝉科）。42 个商业用地被分成两部分，一个在冬季修剪。在 2019 年和 2020 年第一次苜蓿春季切割之前，当造成损坏时，通过扫网对田地每个部分的幼虫丰度进行了采样。由于Bathyplectes anura (Thomson) 和Bathyplectes curculionis (Thomson) 通过在实验室饲养幼虫来估计。冬季切割显着减少了春季幼虫象鼻虫种群，并有利于幼虫寄生率。我们的研究结果表明，冬季扦插是一种有效的苜蓿象鼻虫控制栽培方法，有可能成为综合虫害管理计划的一个组成部分。