Editorial Type:
Article Category: Research Article
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Online Publication Date: 01 Dec 1991

Herbicide Tolerance of Selected Ericaceous Species

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Page Range: 196 – 198
DOI: 10.24266/0738-2898-9.4.196
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Abstract

This study was conducted to determine the tolerance of seven Ericaceous species to 15 herbicide treatments. Treatment response was species dependent. Pre-M (pendimenthalin) at the 2.2 kg/ha (2 lb ai/A) rate reduced top fresh weight of mountain laurel (Kalmia latifolia), flame azalea (Rhododendron calendulaceum) and Carolina rhododendron (Rhododendron carolinianum) while the 4.5 kg/ha (41b ai/A) rate affected these 3 species plus drooping leucothoe (Leucothoe fontanesiana), sourwood (Oxydendrum arboreum), Catawba rhododendron (Rhododendron catawbiense) and azalea ‘Hinocrimson’ (Rhododendron ‘Hinocrimson’). SWGC (pendimethalin) at 3.4 kg/ha (3 lb ai/A) reduced top fresh weight of sourwood, flame azalea and Carolina rhododendron. Goal (oxyfluorfen) + AG98 reduced fresh weight of every species except Carolina rhododendron. Snapshot DF (isoxaben + oryzalin) at 3.4 kg/ha (3 lb ai/A) reduced top fresh weight of mountain laurel and flame azalea. Mountain laurel showed a reduction in fresh weight for Pennant GR (metolachlor) at the 4.5 kg/ha (4 lb ai/A) rate. At the 2.2 kg/ha (2 lb ai/A) rate of Ronstar WP (oxadiazon), reduced Catawba rhododendron top fresh weight, however, Catawba rhododendron was not affected by the 4.5 kg/ha (4 lb ai/A) rate. The Poast (sethoxydim) treatment at 0.6 kg/ha (0.5 lb ai/A) + crop oil concentrate reduced fresh weight of flame azalea. SWGC at 3.4 kg/ha (3 lb ai/A), OH2 (oxyfluorfen + pendimethalin) at 3.4 kg/ha (3.0 lb ai/A), Gallery (isoxaben) at 1.1 kg/ha (1.0 lb ail A), Snapshot GR (isoxaben + trifluralin) at 4.0 kg/ha (3.75 lb ai/A), Derby (metolachlor + simazine) at 5.7 kg/ha (5.0 lb ai/A), and the ready-to-use formulation of sethoxydim did not reduce top fresh weight of any of the seven species tested.

Keywords: Ericaceae; fresh weight; mountain laurel (Kalmia latifolia L.); drooping leucothoe [Leucothoe fontanesiana (Steud.) Sleum]; sourwood (Oxydendrum arboreum DC); flame azalea (Rhododendron calendulaceum Torr.); Carolina rhododendron (Rhododendron carolinianum Rehd.); Catawba rhododendron (Rhododendron catawbiense Michx.); ‘Hinocrimson’ azalea (Rhododendron obtusum (Lindl.) Planch cv. ‘Hinocrimson,’ an old Kurume hybrid) (8).; Pre-M 60 WDG and Southern Weed Grass Control (SWGC, 2.45 GR) (pendimethalin) N-(l-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine; Goal (oxyfluorfen) 2-chloro-l-(3-ethoxy-4-nitrophenoxy)-4-(trifluromethyl) benzene; Ornamental Herbicide 2 (OH2), (oxyfluorfen + pendimethalin), 2-chloro-l-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl) benzene + N-(l-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine; Gallery (isoxaben) N-[3-(l-ethyl-l-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide and isomers; Snapshot 2.5 GR (isoxaben + trifluralin) N-[3-(1-ethyl-l-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide + 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl) benzenamine; Snapshot 80 DF (isoxaben + oryzalin) N-[3-(l-ethyl-l-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide + 4-(dipropylamino)-3,5-dinitrobenzenesulfonamide; Pennant (metolachlor) 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl)acetamide; Derby (metolachlor + simazine) 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl)acetamide + 6-chloro-N,N′-diethyl-l,3,5-triazine-2,4-diamine; Ronstar (oxadiazon) 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H)-one; Poast (sethoxydim) 2-[1-(ethoxyimino)butyl]-5-[2(ethylthio)propyl]-3-hydroxy-2-cyclohexen-l-one; Ready-to-use (RTU) formulation of sethoxydim from BASF (BAS 56216H).; Surfactant, AG-98, Rohm & Haas, Philadelphia, Pennsylvania 19105; Crop Oil (COC), Agri-Dex, Helena Chemical Co., Inman, SC 29615
Copyright: Copyright, All Rights Reserved 1991

Contributor Notes

The research reported in this publication was funded by the North Carolina Agricultural Research Service, Raleigh, NC 27695-7643. Technical assistance of Robbie Wooten, Everett Whitman, Shari Eakes, William Reece, and the staff of the Mountain Horticultural Crops Research Station is gratefully acknowledged.

2Professor, Associate Professor and Graduate Research Assistant, resp.

Received: 14 Feb 1991
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