Are prohexadione calcium and <i>Pseudomonas fluorescens</i> a solution to limit the spread of annual bluegrass (<i>Poa annua</i> L.) on football pitches?

Abstract In 2020, a greenhouse experiment was conducted to investigate the suppression of annual bluegrass ( Poa annua ), which is difficult weed manage in cool-season turfgrass mixtures on football pitches. The efficacy prohexadione calcium (Pc), ethephon (Eth) and Pseudomonas fluorescens against P. , Lolium perenne pratensis tested, as latter two most commonly occur Mesotrione (Mes) used positive control, nontreated grass negative control. Only single species sown each pot. Treatments were randomly distributed for experiments separately: first – unmown before beginning spraying second mowed spraying. both experiments, plant height number tillers measured/counted several times during growing season. grasses sprayed six with Pc, Eth while Mes applied twice. Based performed study, tested products connected whether mowed/cut It has been detected present study that Pc could reduce bluegrass, reduced tillers. Spraying more effective should cause severe damage but without confirmation this study. Results have indicated application can inhibit spread pitches; however, testing their effectiveness under field conditions be well.