Abstract:

To screen soil sealing and stem and leaf herbicides suitable for peony fields, this study evaluated the safety and weed control efficacy of six pre-emergence closed herbicides (Glyphosate, Metformin, Ethoxyfen, Compound Glyphosate·Propynyl Fluoxamine, Prometryn, and Chlorpyruvic Acid Emulsion) and two stem and leaf herbicides (Fluroxypyr Emulsion, Quinclotrimazole Emulsion) on Paeonia lactiflora through field experiments. Among the six pre-emergence herbicides tested, Prometryn showed the highest safety for peony growth, with no significant difference in plant height compared to the control (CK). However, at the tested dosage, its efficacy against field bindweed was relatively poor, reaching only 34.62%, while its control effect on the fresh weight of other weeds was over 80%. In contrast, the mixed formulation of Compound Glyphosate·Propynyl Fluoxamine demonstrated good efficacy against field bindweed, but resulted in a plant height of only 4.57 cm, significantly lower than the CK height of 8.35 cm, with Phytotoxicity reaching grade IV. Both post-emergence herbicides tested were safe for peony growth. Quizalofop-P-ethyl achieved 100% efficacy against green foxtail and crabgrass, while Fluroxypyr provided over 80% control efficacy against broadleaf weeds. In the closed treatment herbicide experiment, comprehensive consideration was given to the control of glyphosate. In the herbicide experiment for stem and leaf treatment, Fluroxypyr can be considered for the control of broad-leaved weeds; Poaceae weeds can be controlled by using Quizalofop-P-ethyl.

Key words: Paeonia lactiflora, herbicide screening, closed herbicide, stem and leaf herbicides, safety