Abstract
Three viral diseases transmitted by aphids can cause significant yield losses in beet, straw cereal and oilseed rape production. For a long time, these crops were protected against yellows by targeting aphids using plant protection products that have recently been banned (neonicotinoid family) or are still authorised, but whose effectiveness may be inadequate following the appearance of aphid populations resistant to certain insecticide active substances. Academic researchers, technical institutes and companies have worked together as part of the ABCD_B research project, with the aim of evaluating new solutions for protecting these crops against viruses. Work was carried out on the three species, both in natural field conditions and under controlled conditions. The results highlighted and quantified differences in varietal sensitivity within each of the crop species (wheat, oilseed rape, sugar beet). At the same time, a major effort to evaluate biocontrol products has produced encouraging results for two active substances (azadirachtin and paraffin oil), even though their efficacy remains significantly lower than that of reference solutions.