Drought affects both crops and their pests, but the effect of the interaction between drought and pests on crops has not been sufficiently understood. The aim of this work is to determine (i) the response of spring wheat (Triticum aestivum) to three watering regimes (soil water capacity of 70, 50 and 40%) and aphid (Metopolophium dirhodum) infestation, and (ii) how drought affect aphid population growth. Seedlings of one drought-susceptible (Quintus) and one drought-tolerant (Septima) cultivar were used, and changes in leaf structural and morphophysiological traits were measured. The age-stage, two-sex life table approach was used to determine aphid population growth. The plant stress and plant vigour hypotheses in this system were tested by analysing correlations between leaf traits and aphid life table parameters. Drought stress negatively affected parameters related to plant vigour (reduced biomass, decrease in \({\varPsi }_{\pi 100}\) and increased resource allocation in structural defence trichomes) regardless of the stress tolerance of the cultivar, although the level of stress was generally greater in Quintus than in Septima. Plants perceived the stress caused by the aphids as significant only under high drought stress, as the physiological response of increasing growth and osmolyte accumulation was triggered under these conditions. This response also benefited the aphids; hence, the population growth of the aphids was most severely affected under moderate drought stress. The reproductive rate was negatively affected by trichome density and positively affected by leaf biomass and \({\varPsi }_{\pi 100}\); these findings provide support for the plant vigour hypothesis for the spring wheat seedling–rose-grain aphid study system.

干旱影响作物及其害虫，但干旱和害虫相互作用对作物的影响尚未得到充分了解。这项工作的目的是确定 (i) 春小麦 ( Triticum aestivum ) 对三种浇水方式（土壤水分容量分别为 70%、50% 和 40%）和蚜虫 ( Metopolophium dirhodum ) 的响应。) 侵扰，以及 (ii) 干旱如何影响蚜虫种群的增长。使用了一种耐旱（Quintus）和一种耐旱（Septima）品种的幼苗，并测量了叶片结构和形态生理性状的变化。年龄阶段，两性生活表方法用于确定蚜虫种群的增长。通过分析叶片性状与蚜虫生命表参数之间的相关性，检验了该系统中的植物胁迫和植物活力假设。干旱胁迫对与植物活力相关的参数产生负面影响（生物量减少，\({\varPsi }_{\pi 100}\)和增加结构防御毛状体的资源分配），无论品种的压力耐受性如何，尽管 Quintus 的压力水平通常高于 Septima。植物仅在高干旱胁迫下才认为由蚜虫引起的胁迫是显着的，因为在这些条件下触发了生长增加和渗透质积累的生理反应。这种反应也有利于蚜虫；因此，蚜虫的种群增长在中度干旱胁迫下受到的影响最为严重。繁殖率受毛状体密度的负面影响，受叶片生物量和\({\varPsi }_{\pi 100}\)的正面影响；这些发现为春小麦幼苗-玫瑰粒蚜研究系统的植物活力假说提供了支持。