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Sod Regrowth of St. Augustinegrass after Preemergence Herbicide Application
Author(s) -
McCarty Lambert B.,
Porter D. Wayne,
Colvin Daniel L.
Publication year - 1995
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1995.00021962008700030017x
Subject(s) - stolon , pendimethalin , atrazine , metolachlor , horticulture , weed , dry weight , chemistry , botany , pesticide , zoology , biology , agronomy
St. Augustinegrass [ Stenotaphrum secundatum (Walt.) Kuntze] sod production involves stolon regeneration from strips left from the previous harvest. Field studies were conducted to evaluate stolon regrowth and rooting following preemergence application of herbicides. Herbicides evaluated were atrazine [6‐chloro‐ N ‐ethyl‐ N' ‐(1‐methylethyl)‐1,3,5‐triazine‐2,4‐diamine], dithiopyr [ S , S ‐dimethyl 2‐(difluoromethyl)‐4‐(2‐methylpropyl)‐6‐(trifluoromethyl)‐3,5‐pyrldinecarbothioate], isoxaben [ N ‐[3‐(1‐ethyl‐l‐methylpropyl)‐5‐isoxazolyl]‐2,6‐dimethoxybenzamide], metolachlor [2‐chloro‐ N ‐(2‐ethyl‐6‐methylphenyl)‐ N ‐(2‐methoxy‐1‐methylethyl) acetarnlde], oxadiazon [3‐[2,4‐dichloro‐5‐(1‐methylethoxy)phenyl]‐5‐(1,1‐dimethylethyl)‐1,3,4‐oxadiazol‐2‐(3 H )‐one], pendimethalin [ N ‐(1‐ethylpropyl)‐3,4‐dimethyl‐2,6‐dinitrobenzenamine] and the combination of metolachlor plus atrazine. Acceptable ‘Floratam’ St. Augustinegrass color was noted following all treatments. Twelve to 24% of the stolons were unrooted 4 to 8 mo after application following treatment with 0.8kg a.i. ha −1 dithiopyr. Five to 22% of the stolons were unrooted 8 mo after treatment with isoxaben at 1.1 kg ha −1 and pendimethalin at 2.2 kg ha −1 . Data collected after 8 mo showed stolon rooting to be similar to the untreated for all treatments. Turfgrass density was unaffected or slightly improved (≈25%) by herbicide treatment and was highest with oxadiazon, metolaehlor, and metolachlor plus atrazine treatments. Neither turfgrass tensile strength nor root dry weight was reduced 14 mo after treatment with any of the herbicides evaluated. Although shortterm (2 to 4 mo) negative effects followed dithiopyr, isoxaben, and pendimethalin treatments, long‐term (≥ 8 mo) effects were transient.