A Roundup herbicide causes high mortality and impairs development of Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae)

• DOI: 10.1016/j.scitotenv.2022.161158
• Publication Date: 2022-12-23T16:03:08Z
• Authors: N. Defarge; M. Otto; A. Hilbeck
• Keywords: Chrysoperla carnea; Ecotoxicity; Abamectin

Glyphosate has and is being used extensively in herbicide formulations worldwide. Thus, glyphosate-based herbicides (GBH) substantially add to the environmental load of pesticides warrant a strict risk assessment. Ecotoxicological testing focuses on non-target plants higher animals while direct effects arthropods are only cursory tested premise contact exposure. However, oral exposure, as we show our case, can be highly relevant for systemic pesticides, such GBH. Specifically, crop systems including genetically modified crops that tolerant GBH, these their breakdown products present both internally externally and, therefore, ingested by crop-associated arthropod fauna. We uptake Roundup formulation WeatherMax larvae lacewing Chrysoperla carnea, model organism ecotoxicity programs. Long-term exposure C. carnea throughout its juvenile life stages was with concentrations ranging from 0.001 1 % dilution, thus, lower than 1.67 recommended field applications. Inhibition metamorphosis observable at 0.1 but concentration 0.5 %, GBH significantly impaired cocoon formation led massive lethal malformations. At half individuals remained permanent no adult hatched alive. The observed followed clear dose-response relationship. hazard caused insecticidal action GHB after safety reveals gap regulatory assessments should urgently addressed, specifically light on-going insect decline.