Tuesday, November 6, 2007

Safety of Various Herbicides on ‘Sea Spray' Seashore Paspalum Seedlings.

Aaron Patton, Michael Richardson, and Jon Trappe. Horticulture, University of Arkansas, 1 University of Arkansas, Fayetteville, AR 72701-1201

There are no reports of herbicide tolerance on seedling seashore paspalum (Paspalum vaginatum Swartz), and currently no herbicides are labeled for use on these seedlings. The objective of this study was to determine which herbicides cause the least amount of injury to seashore paspalum seedlings. Field studies were conducted to assess the tolerance of seashore paspalum (‘Sea Spray’) to herbicides. Applications including sulfentrazone, carfentrazone, triclopyr, clopyralid, fluroxypyr, carfentazone + 2,4-D + MCPP + dicamba, 2,4-D + MCPP + dicamba, quinclorac, MSMA, imazaquin, metsulfuron, sulfosulfuron, halosulfuron, pronamide, siduron, oxadiazon, pendimethalin, dithiopyr, prodiamine, ethofumesate, and fluazifop-P-butyl were applied 2 weeks after emergence of seedlings and compared to an untreated control and a salt water treatment. Coverage 2 weeks after application was greatest among clopyralid, halosulfuron, metsulfuron, quinclorac, carfentrazone, salt water treatment, and the untreated check. Greatest phytotoxicity and reduction in turf coverage resulted from applications of fluazifop-P-butyl, MSMA, imazaquin, ethofumesate, 2,4-D + MCPP + dicamba, and triclopyr.