Control of glyphosate-resistant Canada fleabane [Conyza canadensis (L.) Cronq.] with preplant herbicide tankmixes in soybean [Glycine max. (L). Merr.]

2013 ◽  
Vol 93 (4) ◽  
pp. 659-667 ◽  
Author(s):  
Holly P. Byker ◽  
Nader Soltani ◽  
Darren E. Robinson ◽  
François J. Tardif ◽  
Mark B. Lawton ◽  
...  
Keyword(s):  
Glycine Max ◽  
Seed Production ◽  
Field Trials ◽  
Effective Control ◽  
Conyza Canadensis ◽  
Glycine Max L ◽  
Excellent Control

Byker, H. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. H. 2013. Control of glyphosate-resistant Canada fleabane [ Conyza canadensis (L.) Cronq.] with preplant herbicide tankmixes in soybean [ Glycine max . (L). Merr.]. Can. J. Plant Sci. 93: 659–667. Glyphosate previously provided excellent control of Canada fleabane; however, with the evolution of glyphosate-resistant (GR) Canada fleabane in Ontario, alternative herbicides must be identified for control of this weed in soybean. The objective of this study was to identify preplant herbicide tankmixes that provide effective control of GR Canada fleabane. A total of 12 field trials were completed over a 2-yr period (2011, 2012) in fields previously confirmed with GR Canada fleabane. Preplant tankmixes of glyphosate (900 g a.e. ha−1) plus saflufenacil (25 g a.i. ha−1) or saflufenacil/dimethenamid-p (245 g a.i. ha−1) provided greater than 87% control 4 wk after application (WAA) across all sites. Glyphosate (900 g a.e. ha−1) tankmixed with metribuzin (1120 g a.i. ha−1), cloransulam-methyl (35 g a.i. ha−1) or flumetsulam (70 g a.i. ha−1) provided 78 to 99% control 8 WAA. Control of GR Canada fleabane prior to soybean emergence is essential as currently there are no herbicides that provide acceptable control in-crop. Because of the lack of in-crop options, spring residual herbicides may be required for season long control in regions where Canada fleabane emerges throughout the year to reduce Canada fleabane seed production and populations in subsequent years.

Control of common cocklebur (Xanthium strumarium L.) with pre- and postemergence herbicides in soybean

2008 ◽  
Vol 88 (6) ◽  
pp. 1127-1131
Author(s):  
P. H. Sikkema ◽  
C. Kramer ◽  
J. D. Vyn ◽  
N. Soltani
Keyword(s):  
Glycine Max ◽  
Key Words ◽  
Weed Control ◽  
Dry Weight ◽  
Field Trials ◽  
Xanthium Strumarium ◽  
Glycine Max L ◽  
Excellent Control ◽  
Reduced Density ◽  
Postemergence Herbicides

Field trials were conducted in 2006 and 2007 on three Ontario farms with heavy infestations of cocklebur to determine the effectiveness of various preemergence (PRE) and postemergence (POST) herbicides for control of cocklebur in soybean [Glycine max (L.) Merr.]. There was minimal injury (2% or less) to soybean from the PRE and POST herbicides evaluated. Cloransulam applied PRE provided up to 98% visual control, reduced density 93%, and reduced dry weight of cocklebur 96%. Linuron, metribuzin, imazethapyr, and clomazone applied PRE provided 0 to 77% control and reduced density and dry weight of cocklebur minimally (54% or less) compared with the weedy check. Cloransulam applied POST provided as much as 98% control, reduced density up to 96%, and reduced dry weight of cocklebur as much as 98%. Chlorimuron, imazethapyr, imazethapyr plus bentazon, and glyphosate applied POST provided 49 to 90% control, reduced density 62 to 89%, and reduced dry weight of cocklebur 69 to 92%. Acifluorfen, fomesafen, bentazon, and thifensulfuron applied POST provided 1 to 51% control, reduced density 0 to 80%, and reduced dry weight 0 to 74% compared with the weedy check. Soybean yield increased as much as 79% compared with the weedy check as a result of cloransulam applied PRE or POST. Based on these results, cloransulam applied PRE or POST provides excellent control of cocklebur in soybean. Key words: Cocklebur, weed control, soybean, preemergence herbicide, postemergence herbicide

Control of Glyphosate-Resistant Horseweed (Conyza canadensis) with Dicamba Applied Preplant and Postemergence in Dicamba-Resistant Soybean

2013 ◽  
Vol 27 (3) ◽  
pp. 492-496 ◽  
Author(s):  
Holly P. Byker ◽  
Nader Soltani ◽  
Darren E. Robinson ◽  
François J. Tardif ◽  
Mark B. Lawton ◽  
...  
Keyword(s):  
Broad Spectrum ◽  
Field Trials ◽  
Conyza Canadensis ◽  
Herbicide Application ◽  
Herbicide Resistant ◽  
Late Emergence ◽  
Rescue Treatment ◽  
Control Options ◽  
Initial Control ◽  
Excellent Control

Herbicide-resistant crops, such as glyphosate-resistant (GR) soybean, allow for broad-spectrum, flexible weed control with minimal crop injury; however, the development of GR weeds, such as horseweed, has forced reliance on alternative herbicides for control of these weeds. While preplant (PP) herbicides provide excellent control of GR-horseweed, there are currently no POST herbicide control options within soybean. The objective of this study was to evaluate the efficacy of dicamba for the control of GR-horseweed when applied PP, POST, and sequentially in dicamba-resistant soybean. Dicamba applied PP at 600 g a.e. ha−1provided 90 to 100% control of GR-horseweed 8 wk after application (WAA) across three field trials conducted in Ontario in 2011 and 2012. Similarly, sequential applications provided 91 to 100% control. This technology provides a much-needed POST option of dicamba to be applied as a rescue treatment to control weed escapes caused by late emergence or poor initial control following a PP herbicide application.

Resistance to Frogeye Leaf Spot in Selected Soybean Accessions in MG I through MG VI

2012 ◽  
Vol 13 (1) ◽  
pp. 13 ◽  
Author(s):  
Alemu Mengistu ◽  
Jason Bond ◽  
Rouf Mian ◽  
Randall Nelson ◽  
Grover Shannon ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Glycine Max ◽  
Seed Yield ◽  
Leaf Spot ◽  
Yield Loss ◽  
Field Trials ◽  
Maturity Group ◽  
Cercospora Sojina ◽  
Frogeye Leaf Spot ◽  
Glycine Max L

Frogeye leaf spot (FLS) caused by Cercospora sojina Hara is a disease of soybean [Glycine max (L.) Merr.] that causes significant seed yield loss in warm, humid environments worldwide. The Rcs3 gene in soybean has been reported to condition resistance to all known races of C. sojina. The objectives of this study were to: (i) identify maturity group (MG) I to VI accessions resistant to C. sojina race 11 by field screening at two locations; and (ii) determine if the FLS resistance of the symptomless soybean accessions is likely to be conditioned by the Rcs3 allele. A total of 260 accessions including 12 differentials were evaluated for reaction to race 11 in field trials in Missouri and Illinois during 2009, and 20 accessions that did not develop symptoms were retested in 2010 to validate their resistance. The 20 accessions remained resistant and were tested for the potential presence of Rcs3 allele using molecular markers; and none was predicted to carry the Rcs3 allele. These accessions may contain novel loci for FLS resistance and may be used to broaden the base for developing soybean cultivars with frogeye leaf spot resistance. Accepted for publication 16 April 2012. Published 21 May 2012.

Glyphosate-resistant giant ragweed (Ambrosia trifida L.) control with preplant herbicides in soybean [Glycine max (L.) Merr.]

2012 ◽  
Vol 92 (5) ◽  
pp. 913-922 ◽  
Author(s):  
Joseph P. Vink ◽  
Nader Soltani ◽  
Darren E. Robinson ◽  
François J. Tardif ◽  
Mark B. Lawton ◽  
...  
Keyword(s):  
Glycine Max ◽  
Field Trials ◽  
Yield Losses ◽  
Ambrosia Trifida ◽  
Soybean Yield ◽  
Field Crops ◽  
Giant Ragweed ◽  
Glycine Max L ◽  
Significant Yield ◽  
Residual Control

Vink, J. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. H. 2012. Glyphosate-resistant giant ragweed ( Ambrosia trifida L.) control with preplant herbicides in soybean [ Glycine max (L.) Merr.]. Can. J. Plant Sci. 92: 913–922. Giant ragweed populations in southwestern Ontario have evolved resistance to glyphosate. Glyphosate-resistant (GR) giant ragweed interference in field crops can lead to significant yield losses. Eleven field trials [five with preplant (PP) burndown only and six with PP burndown plus residual herbicides] were conducted in 2010 and 2011 on Ontario farms with GR giant ragweed to evaluate the efficacy of various PP herbicides applied prior to soybean planting. Glyphosate applied at the recommended field dose failed to adequately control GR giant ragweed. The PP herbicides 2,4-D ester, cloransulam-methyl and saflufenacil applied alone and with glyphosate provided 97–99, 68–100 and 71–94% control, respectively and resulted in soybean yields equivalent to the weed-free check. Combinations of glyphosate plus cloransulam-methyl or linuron controlled GR giant ragweed 8 wk after application (WAA), 75–95 and 95–98%, respectively. Residual control with glyphosate plus linuron resulted in soybean yield equivalent to the weed-free check. Based on these results, GR giant ragweed can be controlled prior to soybean planting in southwestern Ontario.

scholarly journals The Increasing Production of Soybean Plants (Glycine max L.) Based on Result Target’s and Nutrient Index

1970 ◽  
Vol 6 (2) ◽  
pp. 319-327
Author(s):  
Michael Gusman Sianturi ◽  
Erwin Masrul Harahap ◽  
Hamidah Hanum
Keyword(s):  
Glycine Max ◽  
Soil Fertility ◽  
Seed Production ◽  
Research Design ◽  
Soil Nutrient ◽  
Target Dose ◽  
Two Factors ◽  
Nutrient Index ◽  
Glycine Max L ◽  
Soybean Plants

The aim of this research was to prove the giving fertilizer with dosage that produces seed production of soybean (Glycine max L.) 3 ton/ha and studying soil fertility through the nutrient indexs. The research was conducted in June 2017 until September 2017 at the market land of 1 Tanjung Sari, Medan Selayang sub-district. The research design is Factorial Random Design with two factors. The first factor is doses of fertilizer with the target of P1 = target 2 ton/ha; P2 = target 3 ton/ha; P3 = target of 4 ton/ha, second factor is treatment of soil nutrient index consist of B1 = 0,8 (100% less 20%); B2 = 0.9 (100% less 10%); B3 = 1 (100% standard nutrient index); B4 = 1.1 (100% plus 10%); B5 = 1.2 (100% plus 20%). The results showed that interaction of fertilizer based result target dose 3 ton/ha and nutrient index 0,9 (Urea : 45 kg/ha, SP-36: 90 kg/ha, KCL: 27 kg/ha, Phonska: 90 kg/ha, Dolomite: 900 kg/ha) reaches production of 2.86 tons/ha. The soil nutrient index found in B2 = 90% (fertilizer dose reduced by 10%) showed that the soil was fertile and gave the nutrient 10%.

Soybean cultivar reaction and row width effect on Sclerotinia stem rot

1993 ◽  
Vol 73 (4) ◽  
pp. 1169-1175 ◽  
Author(s):  
R. I. Buzzell ◽  
T. W. Welacky ◽  
T. R. Anderson
Keyword(s):  
Glycine Max ◽  
Disease Incidence ◽  
Field Trials ◽  
Cultivar Differences ◽  
Stem Rot ◽  
Diseased Plant ◽  
Sclerotinia Stem Rot ◽  
Row Width ◽  
Width Effect ◽  
Glycine Max L

The response of soybean (Glycine max (L.) Merr.) cultivars to Sclerotinia stem rot, caused by Sclerotinia sclerotiorum, was assessed in replicated field trials in 1985–1987 and 1990 to obtain information relating to control of the disease. In 1986 and 1987, there were differences (P = 0.01) in disease incidence among 19 indeterminate cultivars. Cultivar differences in disease incidence were partially related to maturity (R2 = 0.67 in 1986; R2 = 0.37 in 1987) with earlier-maturing cultivars having less disease. Cultivars differed (P = 0.01) in the number of sclerotia produced per diseased plant and per square meter in 1986 and 1987. In a test conducted in 1990 there were differences (P = 0.05) in disease incidence among 14 determinate lines. In three tests in 1985–1986, row spacings of 23, 45 and 69 cm had no significant effect on the incidence of white mold in the cultivars Maple Arrow, Evans, S1346 and Corsoy 79. Yield loss from stem rot may be reduced by planting cultivars that are more resistant, earlier maturing and more tolerant to lodging. This practice would also result in fewer sclerotia to serve as primary inoculum in future years. Key words: Glycine max, soybean, Sclerotinia stem rot, cultivar and row width effects

scholarly journals Efficacy of the herbicide GF-2581 (penoxsulam + florasulam) against broadleaf weeds in olives

2014 ◽  
Vol 60 (No. 12) ◽  
pp. 574-579 ◽  
Author(s):  
Travlos IS ◽  
M. Lysandrou ◽  
V. Apostolidis
Keyword(s):  
Weed Control ◽  
Management Strategies ◽  
Growing Season ◽  
Field Trials ◽  
Conyza Canadensis ◽  
Weed Species ◽  
Stellaria Media ◽  
Excellent Control ◽  
Control Management

Effective weed control in perennial crops is a challenge due to the limited availability of registered herbicides and herbicide resistance. The objective of the study was to evaluate the efficacy of the herbicide GF-2581 (penoxsulam + florasulam) on broadleaf weeds in comparison with other commonly used herbicides. Field trials were conducted in olives, in Etoloakarnania (Agrinio region) for two years (2012 and 2013). Efficacy assessments were made at 30, 60, 90 and 120 days after treatment. The GF-2581 formulation provided excellent control of a broad spectrum of broadleaf weed species. The long-term control of Sonchus oleraceous, Conyza canadensis and Stellaria media, provided by GF-2581 during the growing season was significantly greater than that using flumioxazin. When combined with glyphosate or diquat, the level of control of these three weeds was improved. The GF-2581 agent applied pre-emergence followed 14 days later by application of glyphosate provided 100% control in 2012. Lower efficacy levels were observed in 2013 and may have been the result of higher rainfall when compared to 2012. GF-2581 is an effective herbicide product to control broadleaf weeds, as a part of integrated weed control management strategies in olives.

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