Phytochemicals from Eucalyptus camaldulensis and Coleus barbatus Control Eragrostis plana in Horticulture

Eragrostis plana is an invasive plant in horticulture that is extremely difficult to control. The use of chemical herbicides causes weed resistance and contamination of crops. Therefore, leaf extracts obtained from E. camaldulensis, C. barbatus, and L. leucocephala were evaluated in the control of this weed. The extracts were obtained from leaves by infusion, pressurized liquid extraction, and ultrasound-assisted extraction using water or ethanol as solvents, which are green methods. The phytochemicals from E. camaldulensis and C. barbatus reduced the germination and growth of the weed, reaching up to 97% inhibition of germination, 52% reduction in shoot length, and 46% reduction in root length for the germinated seeds.