Data underlying the publication: Diverse cropping systems lead to higher larval mortality of the cabbage root fly (Delia radicum)

This data belongs to the paper published in Journal of Pest Science, with the title: Diverse cropping systems lead to higher larval mortality of the cabbage root fly (Delia radicum). See the published paper and the readme files for information on methods, techniques and other relevant information.<br>Abstract:We studied how different diversified cropping systems affected the oviposition and abundance of the specialist cabbage root fly Delia radicum, the most important root herbivore in Brassica crops. The cropping systems included a monoculture, pixel cropping, and four variations of strip cropping with varying intra- and interspecific crop diversity, fertilization and spatial configuration. Furthermore, we assessed whether there was a link between D. radicum and other macroinvertebrates associated with the same plants. Cabbage root fly oviposition was higher in strip cropping designs compared to the monoculture and was highest in the most diversified strip cropping design. Despite the large number of eggs, there were no consistent differences in the number of larvae and pupae between the cropping systems, indicative of high mortality of D. radicum eggs and early instars especially in the strip cropping designs. D. radicum larval and pupal abundance positively correlated with soil-dwelling predators and detritivores and negatively correlated with other belowground herbivores. We found no correlations between the presence of aboveground insect herbivores and the number of D. radicum on the roots. Our findings indicate that root herbivore presence is determined by a complex interplay of many factors, spatial configuration of host plants, and other organisms residing near the roots.<br>

本数据集隶属于发表于《害虫科学期刊（Journal of Pest Science）》的论文，论文标题为《多样化种植系统提升甘蓝根蝇（Delia radicum）幼虫死亡率》。相关研究方法、实验技术及其他细节请查阅正式发表的论文与说明文档。
摘要：本研究探究了不同多样化种植系统对专食性甘蓝根蝇（Delia radicum）——十字花科作物中最为关键的地下根部植食性昆虫——的产卵行为与种群丰度的影响。本次实验设置的种植系统涵盖单作、斑块种植（pixel cropping）以及四种不同的条带种植（strip cropping）变体，各变体在作物种内与种间多样性、施肥方案及空间配置上均存在差异。此外，本研究还考察了甘蓝根蝇（D. radicum）与同一寄主植物上伴生的其他大型无脊椎动物之间的关联。研究结果显示：相较于单作系统，条带种植模式下的甘蓝根蝇产卵量更高，其中以多样性最高的条带种植模式产卵量为峰值。尽管产卵量居高，但各种植系统间的幼虫与蛹种群丰度并未出现一致性差异，这表明甘蓝根蝇的卵及早期龄期幼虫死亡率较高，尤其在条带种植模式中更为显著。甘蓝根蝇的幼虫与蛹种群丰度与土壤栖居的捕食性及腐食性大型无脊椎动物呈正相关，与其他地下植食性昆虫呈负相关。本研究未发现地上部植食性昆虫的存在与根部甘蓝根蝇种群数量之间存在关联。综上，本研究结果表明，地下根部植食性昆虫的种群分布受多重因素的复杂交互作用影响，包括寄主植物的空间配置以及根部附近栖息的其他生物。