Reduced use of chemicals in weed management has been identified as a key strategy to increase overall agricultural sustainability. Carabid (Coleoptera: Carabidae) and cricket (Orthoptera:Gryllidae) weed seed predation has shown promise, but also variability, as an additional weed management tool. Therefore, it is important that carabid activity-density and weed seed predation is further explored in a wide variety of crops and cropping systems, including large conventional systems where sustainability gains may be the largest. Here we explored carabid and cricket activity-density, community, and weed seed consumption in commercial conventional pulse crop fields. Pulse crops are increasingly being incorporated in cropping rotations but weed seed predation is hardly explored in this group of crops. We sampled twenty-four large commercial lentil, pea, faba bean, and soybean fields, and found that crop type did not affect levels of seed predation or carabid activity-density but was a factor in shaping the carabid + cricket community. Crop history had an unexpectedly large impact on the community, fields previously planted to canola had relatively high Amara activity-densities. The carabid genera Amara and Pterostichus, as well as crickets were associated with volunteer canola seed predation. None of the studied carabid taxa, nor crickets, were a significant factor explaining kochia seed predation. We also explored the effects of crop canopy-driven microclimate factors on carabid and cricket activity-density and weed seed predation. The Amara, the most abundant granivorous taxon in this study, were positively related to soil temperatures but not to soil light intensity. Our study highlights the importance of cropping history on the community of beneficial insects in crop fields and indicates a taxon specific relationship with soil temperature and weed seed predation.

在杂草管理中减少化学品的使用已被确定为提高整体农业可持续性的关键战略。Carabid（鞘翅目：Carabidae）和蟋蟀（Orthoptera：Gryllidae）杂草种子捕食已显示出希望，但也显示出可变性，作为额外的杂草管理工具。因此，重要的是在各种作物和种植系统中进一步探索carabid 活动密度和杂草种子捕食，包括可持续性收益可能最大的大型传统系统。在这里，我们探索了商业传统豆类作物田中的甲虫和蟋蟀活动密度、群落和杂草种子消耗。豆类作物越来越多地被纳入轮作，但在这组作物中几乎没有探索杂草种子捕食。我们采样了二十四种大的商业扁豆、豌豆、蚕豆和大豆田，并发现作物类型不影响种子捕食水平或carabid 活动密度，而是塑造carabid + 蟋蟀群落的一个因素。作物历史对社区产生了意想不到的巨大影响，以前种植油菜籽的田地相对较高阿马拉活动密度。Carabid 属Amara和Pterostichus，以及蟋蟀与志愿油菜籽捕食有关。研究的carabid 分类群和蟋蟀都不是解释地肤籽捕食的重要因素。我们还探讨了作物冠层驱动的小气候因素对carabid 和cricket 活动密度和杂草种子捕食的影响。在阿马拉，在这项研究中最丰富的类群granivorous，呈正相关的土壤温度，但不要弄脏光强度。我们的研究强调了种植历史对农田有益昆虫群落的重要性，并表明了分类群与土壤温度和杂草种子捕食的特定关系。