Weeds in an era of reduced herbicide dependence

About the project

The project is structured in three Work Packages (WPs). In WP1, we synthesize and analyse the available evidence that estimate the global crop losses to weeds, and the role of weed diversity.

In WP2, we plan a field campaign in 10 organic fields around Uppsala we test in the field the role of weed diversity and weed seed predation to reduce weed species' growth.

Finally, in WP3, we identify factors are important for farmers in relation to their attitudes towards weeds, herbicides, and ecological alternatives for weed regulation.

Background

Weeds can both threaten and enhance crop production, but overreliance on herbicides and simplified cropping systems has allowed a few harmful weed species to dominate. While research suggests that weed diversity can ensure crop yields while supporting biological weed regulation, no such work has tested this.

To sustain crop production, it is crucial to address biotic factors like weeds, which cause greater yield losses than pests or diseases. Weeds however, also support ecosystem functions like pollination, pest control, and seed predation. Climate change, biodiversity loss, and herbicide resistance have reshaped weed communities, posing new challenges. Despite this, weed-related crop losses remain poorly understood, and herbicides are still the primary management tool.

Advancing sustainable weed management requires balancing weeds' negative and positive impacts, testing ecological alternatives to herbicides, and engaging farmers in these efforts.