Tolerance of Containerized Landscape Plants to the Postemergence Herbicides Stinger, Manage and Basagran

Abstract

Abstract Stinger (clopyralid), Manage (MON 12051) and Basagran (bentazon) postemergence applications were evaluated for phytotoxicity on five species of landscape plants grown in containers. Stinger (clopyralid) was less injurious than Manage (MON 12051). Crape Myrtle (Lagerstroemia indica L. ‘Carolina Beauty’) was injured from Stinger (clopyralid) application 3 and 6 weeks after treatment (WAT). Manage (MON 12051) caused foliar damage to Crape Myrtle (Lagerstroemia indica L. ‘Carolina Beauty’) (1992), Cotoneaster (Cotoneaster dammeri C.K. Schneid. ‘Coral Beauty’) (1992 and 1993), and Dwarf Japanese Juniper (Juniperus chinensis procumbens Endl. ‘Nana’) (1993) at 3 and 6 WAT. Foliar applications of Basagran (bentazon) injured Crape Myrtle (Lagerstroemia indica L. ‘Carolina Beauty’) in 1992 and Cotoneaster (Cotoneaster dammeri C.K. Schneid. ‘Coral Beauty’) in both years. Manage (MON 12051) reduced the growth of Cotoneaster (Cotoneaster dammeri C.K. Schneid. ‘Coral Beauty’) in both years. Hetzi Blue (Juniperus chinensis L. ‘Hetzi Glauca’) growth index was reduced by Manage (MON 12051) in 1992. Stinger (clopyralid) reduced the growth of Dwarf Japanese Juniper (Juniperus chinensis procumbens Endl. ‘Nana’) at the highest rate in 1992. Parsons (Juniperus chinensis L. ‘Parsoni’) and Blue Pacific (Juniperus conferta Parl. ‘Blue Pacific’) junipers were not affected by these herbicides in this study.