Dicamba-resistant kochia (Bassia scoparia) in Kansas: characterization and management with fall- or spring-applied PRE herbicides

2019 ◽  
Vol 33 (2) ◽  
pp. 342-348
Author(s):  
Vipan Kumar ◽  
Ryan P. Engel ◽  
Randall Currie ◽  
Prashant Jha ◽  
Phillip W. Stahlman ◽  
...  
Keyword(s):  
Great Plains ◽  
Field Experiments ◽  
Field Studies ◽  
Early Spring ◽  
Garden City ◽  
The Us ◽  
Sites Of Action ◽  
Summer Fallow ◽  
Us Great Plains ◽  
Fallow Phase

AbstractDicamba-resistant (DR) kochia is an increasing concern for growers in the US Great Plains, including Kansas. Greenhouse and field experiments (Garden City and Tribune, KS, in the 2014 to 2015 growing season) were conducted to characterize the dicamba resistance levels in two recently evolved DR kochia accessions collected from fallow fields (wheat–sorghum–fallow rotation) near Hays, KS, and to determine the effectiveness of various PRE herbicide tank mixtures applied in fall or spring prior to the fallow year. Dicamba dose–response studies indicated that the KS-110 and KS-113 accessions had 5- to 8-fold resistance to dicamba, respectively, relative to a dicamba-susceptible (DS) accession. In separate field studies, atrazine-based PRE herbicide tank mixtures, dicamba + pendimethalin + sulfentrazone, and metribuzin + sulfentrazone when applied in the spring had excellent kochia control (85% to 95%) for 3 to 4 mo at the Garden City and Tribune sites. In contrast, kochia control with those PRE herbicide tank mixtures when applied in the fall did not exceed 79% at the later evaluation dates. In conclusion, the tested kochia accessions from western Kansas had evolved moderate to high levels of resistance to dicamba. Growers should utilize these effective PRE herbicide tank mixtures (multiple sites of action) in early spring to manage kochia seed bank during the summer fallow phase of this 3-yr crop rotation (wheat–corn/sorghum–fallow) in the Central Great Plains.

Herbicide programs to manage glyphosate/dicamba-resistant kochia (Bassia scoparia) in glyphosate/dicamba-resistant soybean

2020 ◽  
Vol 34 (4) ◽  
pp. 568-574
Author(s):  
Ramawatar Yadav ◽  
Vipan Kumar ◽  
Prashant Jha
Keyword(s):  
Grain Yield ◽  
Weed Control ◽  
Great Plains ◽  
Field Experiments ◽  
Control Strategies ◽  
Effective Control ◽  
The Us ◽  
Herbicide Programs ◽  
Us Great Plains

AbstractEvolution of kochia resistance to glyphosate and dicamba is a concern for growers in the US Great Plains. An increasing use of glyphosate and dicamba with the widespread adoption of glyphosate/dicamba-resistant (GDR) soybean in recent years may warrant greater attention. Long-term stewardship of this new stacked-trait technology will require the implementation of diverse weed control strategies, such as the use of soil-residual herbicides (PRE) aimed at effective control of GDR kochia. Field experiments were conducted in Huntley, MT, in 2017 and 2018, and Hays, KS, in 2018 to determine the effectiveness of various PRE herbicides applied alone or followed by (fb) a POST treatment of glyphosate plus dicamba for controlling GDR kochia in GDR soybean. Among PRE herbicides tested, sulfentrazone provided complete (100%), season-long control of GDR kochia at both sites. In addition, PRE fb POST programs tested in this study brought 71% to 100% control of GDR kochia throughout the season at both sites. Pyroxasulfone applied PRE resulted in 57% to 70% control across sites at 9 to 10 wk after PRE (WAPRE). However, mixing dicamba with pyroxasulfone improved control up to 25% at both sites. Kochia plants surviving pyroxasulfone applied PRE alone produced 2,530 seeds m−2 compared with pyroxasulfone + dicamba (230 seeds m−2) at the Montana site. No differences in soybean grain yields were observed with PRE alone or PRE fb POST treatments at the Montana site; however, dicamba, pyroxasulfone, and pendimethalin + dimethenamid-P applied PRE brought lower grain yield (1,150 kg ha−1) compared to all other tested programs at the Kansas site. In conclusion, effective PRE or PRE fb POST (two-pass) programs tested in this research should be proactively utilized by the growers to manage GDR kochia in GDR soybean.

Wheat Curl Mite Resistance in Hard Winter Wheat in the US Great Plains

Crop Science ◽  
2016 ◽  
Vol 57 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Smit Dhakal ◽  
Chor-Tee Tan ◽  
Li Paezold ◽  
Maria P. Fuentealba ◽  
Jackie C. Rudd ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Great Plains ◽  
Wheat Curl Mite ◽  
The Us ◽  
Us Great Plains

Evaluation of fungicide efficacy on sunflower rust (Puccinia helianthi) on oilseed and confection sunflower

2021 ◽  
Author(s):  
Brandt Berghuis ◽  
Andrew Friskop ◽  
Michelle Gilley ◽  
Jessica Halvorson ◽  
Bryan Hansen ◽  
...  
Keyword(s):  
Great Plains ◽  
Field Experiments ◽  
Field Trials ◽  
Northern Great Plains ◽  
Puccinia Helianthi ◽  
Action Threshold ◽  
The Us ◽  
Fungicide Efficacy ◽  
Rust Severity ◽  
Important Disease

Sunflower rust, caused by Puccinia helianthi, is an economically and globally important disease of sunflower. Two types of sunflowers are produced in the US Northern Great Plains; the oilseed type and the confection type. Although approximately 80% of the acreage in this region is planted as the oilseed type sunflower, fungicide efficacy and timing studies have been conducted primarily on the more rust-susceptible confection type. A total of ten sunflower rust efficacy field experiments were conducted on oilseed type and confectionary type hybrid trials from 2016-2018. Eleven fungicides from three FRAC groups were evaluated for efficacy and protection of yield. Severity differences among fungicide treatments were identified in both confection and oilseed type sunflower trials. A combined analysis of all confection field trials (five) indicated that rust severity was lower in all fungicide treatments as compared to the non-treated control. Despite rust severity levels below the fungicide action threshold for confection sunflower, seven of the eleven fungicide treatments had yield higher than the non-treated control. In oilseed trials, rust severity was lower in all fungicide treatments as compared to the non-treated control, similar to the findings of the confection type. Rust severity was too low to detect yield differences in oilseed trials. Additional work is needed to elucidate yield-loss potential on oilseed type sunflower and refine the fungicide action threshold on confection type sunflower.

scholarly journals Current Status and Soil Biology Impacts of Organic Conservation Tillage in the US Great Plains

2019 ◽  
pp. 11-23
Author(s):  
Shabeg S. Briar ◽  
Patrick M. Carr ◽  
Greta G. Gramig ◽  
Fabian D. Menalled ◽  
Perry R. Miller
Keyword(s):  
Great Plains ◽  
Conservation Tillage ◽  
Current Status ◽  
Soil Biology ◽  
The Us ◽  
Us Great Plains

Camelina sativa as a fallow replacement crop in wheat-based crop production systems in the US Great Plains

2018 ◽  
Vol 111 ◽  
pp. 22-29 ◽  
Author(s):  
Augustine K. Obour ◽  
Chengci Chen ◽  
Henry Y. Sintim ◽  
Kent McVay ◽  
Peggy Lamb ◽  
...  
Keyword(s):  
Great Plains ◽  
Crop Production ◽  
Production Systems ◽  
Camelina Sativa ◽  
The Us ◽  
Us Great Plains

Emergence Dynamics of Kochia (Kochia scoparia) Populations from the U.S. Great Plains: A Multi-Site-Year Study

Weed Science ◽  
2017 ◽  
Vol 66 (1) ◽  
pp. 25-35 ◽  
Author(s):  
Vipan Kumar ◽  
Prashant Jha ◽  
J. Anita Dille ◽  
Phillip W. Stahlman
Keyword(s):  
New Mexico ◽  
Great Plains ◽  
Field Experiments ◽  
Emergence Period ◽  
Emergence Pattern ◽  
The North ◽  
Rate Of Emergence ◽  
Sites Of Action ◽  
Rapid Emergence ◽  
The U.S

Evolution of kochia biotypes resistant to multiple herbicide sites of action is an increasing concern for growers across the U.S. Great Plains. This necessitates the development of integrated strategies for kochia control in this region based on improved forecasting of periodicity and patterns of kochia emergence in the field. Field experiments were conducted near Huntley, MT, in 2013 and 2014, and in Manhattan and Hays, KS, in 2013 to characterize the timing and pattern of emergence of several kochia populations collected from the U.S. Great Plains’ states. The more rapid accumulation of growing degree days (GDD) resulted in a shorter emergence duration (E90–E10) in 2014 compared with 2013 in Montana. Kochia populations exhibited an extended emergence period (early April through mid-July). Among all kochia populations, in 2013, Kansas-Garden City (KS-GC), Kansas-Manhattan (KS-MN), Oklahoma (OK), and Montana (MT) populations began to emerge earlier, with a minimum of 151 cumulative GDD to achieve 10% cumulative emergence (E10values) in Montana. The New Mexico-Los Lunas (NM-LL) population exhibited a delayed onset but a rapid emergence rate, while the North Dakota (ND) and Kansas-Colby (KS-CB) populations emerged over a longer duration (E90–E10of 556 and 547 GDD, respectively) in 2013 in Montana. In 2013 at the two locations in Kansas, kochia populations exhibited a similar emergence pattern, with no differences in the time to initiate germination (E10), rate of emergence (parameterb), or duration of emergence (E90–E10). At Hays, KS, the GDD for E50and E90were less for ND compared with KS-MN and KS-GC local populations. In 2014 the KS-MN kochia population exhibited an early (ED10value of 215 GDD) but a more gradual emergence pattern (E90–E10=526 GDD) in Montana. In contrast, OK and New Mexico-Las Cruces (NM-LC) populations had an early and a more rapid emergence pattern (E90–E10=153 and 154 GDD, respectively). Kochia in Montana exhibited two to four emergence peaks. This differential emergence pattern of kochia populations reflects the occurrence of different emergence “biotypes” and emphasizes the need to adopt more location-specific and diversified weed control tactics to manage kochia seedbanks.

Sign in / Sign up

Export Citation Format

Share Document