Stimulation of Early Post-Emergence Growth of Alopecurus myosuroides and Apera spica-venti Following Spray Application of ACCase Inhibitors

Resistance of blackgrass (Alopecurus myosuroides Huds.) and silky bentgrass (Apera spica-venti (L.) P. Beauv.) to ACCase inhibitors is a serious issue in winter cereals throughout Europe, especially as hormesis induced by herbicides has been observed some populations. According the literature, growth-stimulating herbicide rates are on rise. The aim this study was assess responses A. spica-venti, which potentially resistant inhibitors, fenoxaprop-P-ethyl pinoxaden applied at up 8 times greater than their registered rates. reaction resulted an increase biomass gain six four populations, respectively. In one population myosuroides, statistically significant (46.4% 55.3%). All three populations tested were least partially stimulated fenoxaprop-P-ethyl, while only APSII (significant 43.8%). Predictions possible impact reproductive potential allow genotypes be identified whose reproduction may herbicides. results indicate that can induce mechanisms reduce negative herbicides, with demonstrating effect stimulating accumulation treated plants.