Herbicide tolerance and weed control for transplanted short-day onion established with PlantTape®

Timothy L. Grey; Allison D. Couch; Brian M. Swartz; Timothy Coolong; Timothy L. Grey; Allison D. Couch; Brian M. Swartz; Timothy Coolong

doi:10.48130/TIH-2023-0028

Figures (0) Tables (2)

Treatment	Timing	Rate (g ai·ha⁻¹)	Injury (%)	Height (cm/plant)		Yield (kg·ha⁻¹)
Treatment	Timing	Rate (g ai·ha⁻¹)	Injury (%)	VOVRC^**	CF^**	VOVRC	CF
Untreated			0 d***	21.8 a	16.5 a	28,090***	8,590 b
Oxyfluorfen	POST-T	1121	9 bc	22.6 a	16.9 a	28,850 c	20,450 a
Oxyfluorfen	POST-T	2242	10 abc	22.2 a	15.7 a	30,030 c	15,020 ab
Pendimethalin	POST-T	1121	11 ab	22.3 a	16.0 a	32,360 bc	13,710 ab
Pendimethalin	POST-T	2242	9 bc	23.2 a	16.9 a	43,540 ab	15,320 ab
S-metolachlor	POST-T	1121	9 bc	22.5 a	16.1 a	30,860 c	15,590 ab
Oxyfluorfen plus pendimethalin	POST-T	1,121 + 1,121	14 a	23.3 a	16.3 a	34,930 bc	11,770 ab
Oxyfluorfen plus pendimethalin	POST-T	2,242 + 2,242	11 ab	22.6 a	14.9 a	33,310 bc	13,620 ab
Oxyfluorfen plus pendimethalin fb Oxyfluorfen plus pendimethalin	POST-T POST	1,121 + 1,121 1,121 + 1,121	6 c	23.4 a	14.7 a	37,370 abc	13,980 ab
S-metolachlor fb Oxyfluorfen plus pendimethalin	POST-T POST	560 1,121 + 1,121	10 abc	22.8 a	16.6 a	48,280 a	15,200 ab
S-metolachlor fb Oxyfluorfen plus pendimethalin	POST-T POST	560 2,242 + 2,242	6 c	22.9 a	14.8 a	37,640 abc	14,240 ab
, Onion PlantTape® transplanting dates: 14 Nov 2017, VOVRC; 5 Dec 2017, CF. , Vidalia Onion and Vegetable Research Center, VOVRC; Commercial Farm – Reidsville GA, CF; post applied herbicide on day of transplanting, POST-T; post applied herbicides 10 d after transplanting, POST; followed by, fb. **, For weed control data analysis, data were arranged as a split-plot design where fixed effects were location, herbicide treatment and their interaction. Two random effects were block and block by location. PROC MIXED was used to conduct ANOVA, and PROC PLM was applied to test mean differences using Tukey-Kramer test at 0.05 significance level, where values followed by the same letter do not differ. Injury data was combined for presentation across locations, taken 6 weeks after planting.

Table 1.

Herbicide treatment effects for tolerance experiments using PlantTape® Vidalia onion transplants* for injury, height, and yield in Tattnall County Georgia.

Treatment	Timing	Rate (g ai·ha⁻¹)	Injury (%)	Height (cm/plant)		Cutleaf (%)	Yield (kg·ha⁻¹)
Treatment	Timing	Rate (g ai·ha⁻¹)	Injury (%)	VOVRC**	CF**	Eveningprimrose	VOVRC	CF
Untreated			0 e***	22.3 cde	15.8 b	0 d	19,788 f	8,109 bc
Oxyfluorfen	POST-T	560	8 bcd	24.3 ab	18.8 a	92 a	33,278 a-f	21,205 a
Oxyfluorfen	POST-T	1,121	8 bcd	23.2 a-d	19.1 a	96 a	27,520 c-f	19,267 a
Oxyfluorfen	POST-T	2,242	8 bcd	23.0 a-d	18.4 ab	99 a	42,697 ab	19,752 a
Pendimethalin	POST-T	560	10 abc	23.3 a-d	18.3 ab	41c	28,201c-f	8,360 bc
Pendimethalin	POST-T	1,121	8 bcd	22.8 a-e	16.3 ab	42 c	22,102 ef	9,562 bc
Pendimethalin	POST-T	2,242	11 ab	23.9 abc	18.0 ab	78 ab	32,686 a-f	16,128 ab
S-metolachlor	POST-T	560	10 abc	21.9 de	16.9 ab	48 ab	24,255 ef	5,047 c
S-metolachlor	POST-T	1,121	13 a	21.1 e	17.4 ab	53 bc	29,421b-f	14,585 ab
Oxyfluorfen plus pendimethalin	POST-T	1,121 + 1,121	4 de	24.5 a	17.0 ab	97 a	35,341a-e	14,460 ab
Oxyfluorfen plus pendimethalin	POST-T	2,242 + 2,242	10 abc	23.2 a-d	18.4 ab	99 a	36,687 a-d	15,431 ab
Oxyfluorfen plus pendimethalin fb Oxyfluorfen plus pendimethalin	POST-T POST	1,121 + 1,121 1,121 + 1,121	8 bcd	22.5 b-e	16.4 ab	99 a	32,148 a-f	9,544 bc
S-metolachlor fb Oxyfluorfen plus pendimethalin	POST-T POST	560 1,121 + 1,121	6 de	24.1 a-c	17.3 ab	99 a	45,137 a	13,180 abc
S-metolachlor fb Oxyfluorfen plus pendimethalin	POST-T POST	560 2,242 + 2,242	9 abc	23.4 a-d	18.9 a	99 a	40,436 abc	16,523 ab
, Onion PlantTape® transplanting dates: 14 Nov 2017, VOVRC; 5 Dec 2017, CF. Six weeks after establishment, maintained weed free for the remainder of the season by hand weeding. , VOVCR = Vidalia Onion and Vegetable Research Center, Commercial Farm – Reidsville GA, CF; post applied herbicide on day of transplanting, POST-T; post applied herbicides 10 days after transplanting, POST; followed by, fb. **, For weed control data analysis, data were arranged as a split-plot design where fixed effects were location, herbicide treatment and their interaction. Two random effects were block and block by location. PROC MIXED was used to conduct ANOVA, and PROC PLM was applied to test mean differences using Tukey-Kramer test at 0.05 significance level, where values followed by the same letter do not differ. Injury data was combined for presentation across locations, taken 6 weeks after planting. Injury data at 6 weeks after application, and cutleaf eveningprimrose data taken prior to harvest. Data were combined for presentation.

Table 2.

Herbicide treatment effects for efficacy evaluation using PlantTape® Vidalia onion transplants* for injury, height, cutleaf eveningprimrose control, and yield in Tattnall County Georgia.