Glyphosate Herbicide Devastates Earthworm Reproduction

A controlled greenhouse study has revealed a significant impact of glyphosate-based herbicides on earthworm populations. Within three months, the reproduction of one common earthworm species plummeted by 56%. Researchers observed a stark decline in the hatching rate of cocoons, dropping from 71% to 32% after herbicide application.

Beyond reproduction, the study noted changes in earthworm activity. While one species initially showed increased surface casting, this activity sharply declined by 46%. The herbicide treatment also led to a dramatic surge in plant-available nitrate (1,592%) and phosphate (127%) in the soil, attributed to the death of vegetation.

These findings, published in Scientific Reports, highlight the hidden ecological costs of widespread herbicide use. The experiment, conducted by the University of Natural Resources and Life Sciences Vienna, used mesocosms containing soil, plants, and earthworms. It underscores the need to assess pesticide impacts beyond targeted weeds, considering their effects on crucial soil organisms like earthworms.