Using Herbicides and Perennial Ryegrass to Renovate Turf Dominated by Annual Bluegrass

摘要

Annual bluegrass (ABG; Poa annua L.) is among the most problematic weeds in golf and sports turfs. Perennial ryegrass (PRYE; Lolium perenne L.) can be more effectively seeded into existing turfs compared with other cool-season turfgrasses due to its quick germination and seedling vigor. Herbicide programs are often used to suppress ABG encroachment into newly renovated turfs. The objective of this study was to assess the effectiveness of herbicide programs designed to suppress ABG in turf seeded withPRYE. Trials were initiated during September 2015 and 2016 on a mature stand of ABG in North Brunswick, NJ. Treatments consisted of 13 herbicide programs and a nontreated check. Programs involved applications of glyphosate, ethofumesate, mesotrione, andamicarbazone applied during September through December 2015 and 2016. Separate trial areas were core cultivated with soil reincorporated; 'Manhattan 5 GLR PRYE was slit-seeded on 14 Sep. 2015 and 16 Sep. 2016. Glyphosate followed by (fb) seeding did notaffect PRYE establishment compared to seeding alone (nontreated). Three autumn applications of ethofumesate resulted in the greatest PRYE cover and best ABG control by the following spring in both years. All mesotrione herbicide programs suppressed ABGencroachment. Applications of mesotrione + amicarbazone prior to PRYE seeding did not affect PRYE establishment compared to most mesotrione-only herbicide programs.