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Subject: Floriculture and Landscaping × Author: Gurinder Singh × End date: 2022 × Start date: 2022 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Effect of post-emergence herbicides on weed control in lawn (Cynodon Dactylon L.) Selection no. 1
    (Punjab Agricultural University, Ludhiana, 2022) Gurinder Singh; Simrat Singh
    The present study entitled “Effect of post-emergence herbicides on weed control in lawn (Cynodon dactylon L.) Selection No. 1” was conducted in established lawns at three different locations at Punjab Agricultural University, Ludhiana campus during both winter and summer season of year 2021. The experiment was laid out in randomized complete block design with 15 treatments replicated thrice. Fifteen treatments comprised isoproturon (0.937 kg ha-1), mesosulfuron + iodosulfuron (0.014 kg ha-1, clodinafop + metribuzin (0.216 kg ha-1), 2,4-D amine (0.500 kg ha-1), bispyribac sodium (0.025 kg ha-1) metribuzin (0.120 kg ha-1), metsulfuron (0.005 kg ha-1), carfentrazone-ethyl (0.020 kg ha-1), metsulfuron + carfentrazone- ethyl (0.025 kg ha-1), metsulfuron-methyl + chlorimuron-ethyl (0.004 kg ha-1), ethoxysulfurin (0.018 kg ha-1), halosulfuron (0.050 kg ha-1), atrazine (1.000 kg ha-1) including two hand weedings (at 15 days interval) and un-weeded control. The results revealed that clodinafop + metribuzin (0.216 kg ha-1) reduced the weed density and dry weight of Digitaria sanguinalis and Dactyloctenium aegyptium. Isoproturon (0.937 kg ha-1) provided complete control of Poa annua whereas bispyribac sodium (0.025 kg ha-1) was found effective against Dicanthium annulatum upto 60 days after spray (DAS). Weed density and dry weight of Paspalum dilatatum weed was markedly reduced by mesosulfuron + iodosulfuron (0.014 kg ha-1). Metsulfuron + carfentrazone-ethyl (0.025 kg ha-1) provided complete control of broadleaf weeds (Gnaphalium purpureum, Oxalis corniculata, Veronica agrestis, Desmodium triflorum, Coronopus didymus, Erigeron canadensis, Stellaria media, Boerhavia diffusa and Alysicarpus vaginalis) upto 60 DAS. Halosulfuron (0.050 kg ha-1) effectively controlled Cyperus rotundus upto 45 DAS. Metsulfuron + carfentrazone-ethyl (0.025 kg ha-1) (85.5%) recorded highest weed control efficiency (WCE) in winter season whereas clodinafop + metribuzin (0.216 kg ha-1) (46.2 %) and bispyribac sodium (0.025 kg ha-1) (43.5 %) recorded highest WCE in summer season. Sward height and dry weight of turfgrass was found negatively correlated with the weed density. Turfgrass phytotoxicity was observed in clodinafop + metribuzin (0.216 kg ha-1) however, the grass recovered after 35 DAS in winter season, whereas in summer season, no phytotoxicity symptoms appeared. Turfgrass colour rating of eight was adjudged at all the locations during both the seasons.