<p>Flower strips in agroecosystems contribute to insect conservation and can favor biological control of crop pests. First, we compared a flower mixture tailored to attract and support natural enemies of aphids, to a subsidized mixture, on the attraction and support of functional insect biodiversity. Second, we tested the in-field deployment of flower strips set at 27&#xa0;m intervals with sugar beet crop to enhance the regulation of aphid pests, independently of the flower mixture. The tailored mixture showed a more consistent flowering cover, and a significantly higher presence of aphids serving as alternative prey/hosts, than the subsidized mixture. The abundance of natural enemies was low in the flower strips and was not significantly different between the two mixtures, while non-predatory hoverflies were numerous, and significantly more abundant in the tailored mixture. The abundance of <i>Aphis fabae</i> was significantly reduced on sugar beet bordered by in-field flower strips. The abundance of <i>Myzus persicae</i> followed a similar trend, but with a high variability leading to non-significant differences between fields. Predators on sugar beet were mainly ladybird beetles and hoverflies, which abundance was significantly correlated with the abundance of <i>Aphis fabae</i>. By tailoring the plant species composition of mixtures, we demonstrate that flower strips can support both natural enemies and non-predatory insects, offering potential for multifunctional habitats. Their deployment within fields significantly contributes to protecting crops against aphids. As such, tailored and in-field flower strips represent strategic tools to design pest suppressive agroecosystems.</p>