Clover is used in agriculture for fodder and green manure and today Sweden is world leading in producing organic clover seeds. However, the yield varies heavily between years and growers, partly because of damages by clover seed weevils. Effective suppression methods are entirely missing for organic production, whereas neonicotenoids have been successfully used in conventional farming during the last years. However, this solution might not last long, due to documented negative effects of these substances on e.g. pollinators and EU has banned three of them. This project will deepen and widen the studies of odour mediated behaviours in clover seed pest insects, with the goal to develop methods that will improve yields and at the same time minimize adverse effects on the environment or other organisms. In addition to the weevils, a seed consuming moth and a parasitoid (natural enemy) will be studied, as will the hibernation and dispersal of the weevils.