Research into beet viral yellows has identified the use of companion plants as a promising strategy for managing the disease, although they are not yet as effective as chemical treatments. Between 2021 and 2026, trials tested various plant species, including grasses such as wild oats and spring barley, and legumes like vetch, clover, and peas. Audrey Fabarez, coordinator of the Experimental Pilot Farms of the National Research and Innovation Plan (PNRI), explains that legumes help reduce competition with beets but are not compatible with herbicide programs. As a result, the focus has shifted to spring barley and wild oats. These companion plants achieved about 50% efficiency compared to 80 to 90% for a chemical reference. The goal is to complement rather than replace chemical treatments, with the presence of companion plants allowing for a delay in the first treatment. One of the main challenges of using companion plants is the cost, which includes additional passes and seed purchases. However, using farm seeds can help reduce expenses. Managing the destruction of companion plants is also critical, as they continue to affect aphids until the 8-10 leaf stage of beets but can lead to yield losses of 15 to 20% if left too long. It is recommended to destroy them at the 4-leaf stage or 6 leaves if the weather is not too dry. The overall cost of this strategy is estimated at about 100 € per hectare, with herbicide application being the most significant expense. This cost depends on whether the herbicide was already planned in the weeding program. Companion plants are discouraged in the presence of resistant grasses, where the Institute for the Development of Beet (ITB) is instead evaluating the interest of a mulch from a winter cover. Other methods are also being explored, including the Insior GrA granules developed by Agriodor, an olfactory repellent biocontrol technology. However, results remain difficult to interpret at this stage, depending on the number of applications. The positioning of the application appears to play a major role. Researchers are also evaluating the effects of pheromones intended to attract natural pest predators, one of which specifically targets ladybugs to strengthen the natural regulation of aphids. The bio-insecticide Armélis, proposed by InCeres, has entered the trial network for the first year. Although data are insufficient to draw conclusions, initial results show an increase in efficiency when combined with Teppeki. The goal is not to reduce insecticide doses at the risk of favoring resistance. Entomopathogenic fungi are also being studied, but their use has not yet been transposed at the field scale. The paraffin oil Illion, already applied on potatoes, is being evaluated for its potential to reduce viral transmission and the expression of yellows. In parallel with the PNRI, other studies funded under the Ecophyto program are exploring the behavior of aphids with respect to commercial beet varieties. Researchers note that there are "huge differences" in the reduction of aphids in the field and, consequently, in the symptoms of yellows. This is a promising track, with the aim of proposing combinations of solutions that can effectively manage the disease while minimizing the reliance on chemical treatments.