D3456: Effect of cover crops on arthropod pests and beneficials in hops

The integration of cover crops into hop production systems is an increasingly explored strategy for enhancing sustainable pest management. This study assesses the impact of cover crops on arthropod pest populations and beneficial insects within commercial hop yards. Cover crops, such as flower mixes, legumes, and grasses, have the potential to influence arthropod communities by modifying microhabitats, increasing floral resources, and enhancing predator and parasitoid abundance. The use of cover crops in the allies is a common practice among hop growers aiming to control weeds, reduce soil loss, and prevent excessive dust during hot and dry months. However, no formal assessment of the effect of cover crops on arthropod pests and beneficials exists in the state, especially since this practice is extremely variable among farmers, going from grasses to broad leaf species and from annual to perennial mixes. In this regard, there is no science-based knowledge available to explain the benefits of ground cover to reduce costs, increase yields, and the compatibility with current pest control and conservation strategies in the Pacific Northwest. This project will provide a foundation and deeper understanding of a common practice in hops, helping to develop effective management programs for the control of key arthropod pests and the support of beneficials. These results are expected to have a positive impact on hop growers and will enhance extension program activities.