Soybean Herbicide Program Comparison

Amit Jhala Author

07/08/2021 Added

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Soybean Herbicide Program Comparison presentation at field day, June 2021

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[00:00:00.303](gentle music)
[00:00:06.430]Welcome to 2021 Weed Management Field Day
[00:00:09.390]in Corn, Soybean, and Sorghum at South Center Ag Lab.
[00:00:14.120]We had in-person field day on June 23rd, 2021.
[00:00:19.370]And if you were not able to attend in-person field day,
[00:00:22.410]we are bringing this virtual field day
[00:00:24.590]so you will able to see this whenever you have time.
[00:00:27.430]So 2021 was a great year.
[00:00:29.980]We started with normal planting of this project,
[00:00:34.470]particularly in the first week of May.
[00:00:36.910]And the main objective of this project
[00:00:38.700]is to compare different herbicide programs
[00:00:41.720]submitted by industry
[00:00:43.740]and to provide some unbiased comparison,
[00:00:46.160]and then growers and crop consultants can decide
[00:00:49.160]which herbicide to choose.
[00:00:50.820]So this is an opportunity for industry
[00:00:52.680]to partner with University of Nebraska-Lincoln.
[00:00:55.750]And then we provide this best demonstration for people
[00:01:00.600]which herbicide program you can choose
[00:01:02.740]in your corn and soybean herbicide programs.
[00:01:05.280]Particularly, I'm going to start
[00:01:06.730]with soybean demonstration project
[00:01:10.040]where we have about 13 treatments comparison.
[00:01:13.900]Most of them are pre-emergence
[00:01:15.410]followed by post-emergence herbicide programs
[00:01:17.890]that we are comparing at South Central Ag Lab.
[00:01:22.470]Soil here is silty clay loam soil.
[00:01:26.430]It's irrigated.
[00:01:28.190]But this year, it was only one-time irrigation
[00:01:31.210]because we had plenty of rain in the month of May
[00:01:34.100]that also helped us to activate the residual herbicides
[00:01:37.280]we applied couple of days after planting soybean.
[00:01:40.750]So this project particularly,
[00:01:42.850]if you will see here, this is untreated control plot.
[00:01:46.750]We have number of weeds.
[00:01:48.180]For example, palmer amaranth is very common here.
[00:01:52.280]We also have some velvetleaf,
[00:01:56.380]common lambsquarters, and waterhemp.
[00:02:00.350]And we also have some foxtail species.
[00:02:04.340]Most of them are yellow foxtail,
[00:02:06.340]and some of them are giant foxtail.
[00:02:08.420]So we have good combination of broadleaf
[00:02:11.790]as well as grass weeds,
[00:02:13.590]which is an ideal situation
[00:02:14.960]to test different herbicide programs,
[00:02:17.050]to test on how good they will be
[00:02:19.370]on controlling particularly some of the broadleaf weeds
[00:02:23.090]that we do have in the state of Nebraska.
[00:02:26.980]So now I'm going through the next plot.
[00:02:31.810]This project
[00:02:34.490]is about applying Panther MTZ pre-emergence,
[00:02:40.380]and then we applied Credit Xtreme,
[00:02:44.350]which is a glyphosate-based herbicide
[00:02:46.630]applied post-emergence,
[00:02:47.720]and we are seeing really very good control of weeds.
[00:02:51.980]I'm not seeing any new emergence in this plot,
[00:02:54.980]so this is really a good program to consider.
[00:02:58.180]This is because Panther MTZ is a herbicide
[00:03:01.550]with multiple mode of action.
[00:03:04.200]It has at least three different herbicide chemistries,
[00:03:06.700]and it was applied pre-emergence
[00:03:08.860]two days after planting soybean.
[00:03:11.490]It has provided initial control
[00:03:13.330]of majority of the broadleaf and grass weeds.
[00:03:15.840]And then application of glyphosate post-emergence
[00:03:18.740]has provided control of majority of the weeds
[00:03:23.380]that were existing at the time of application.
[00:03:26.020]And now the soybean looks good, and there are no any weeds,
[00:03:29.290]so this is one of the best treatments
[00:03:31.900]that we do have here in this program.
[00:03:35.290]And last year, we had corn,
[00:03:36.550]so you're also seeing some corn residues.
[00:03:38.800]We no-till plant soybean in this field,
[00:03:41.670]which is very common practice among corn and soybean growers
[00:03:44.730]in the state of Nebraska.
[00:03:45.980]So we are trying to match our practice
[00:03:48.850]with the growers' practice
[00:03:50.000]so it will be easy for them to adopt and understand.
[00:03:55.360]Similarly, we have some other programs here,
[00:03:58.820]for example, Panther MTZ,
[00:04:00.520]which is, again, metribuzin-based herbicide.
[00:04:04.630]It has three different herbicide chemistries
[00:04:06.740]and, again, very good with control.
[00:04:09.783]Yeah.
[00:04:10.616]This is AUTHORITY MTZ,
[00:04:13.120]which is, again, a combination of Spartan and metribuzin
[00:04:17.920]applied pre-emergence,
[00:04:19.460]and it has provided very good weed control initially.
[00:04:22.920]I'm not seeing any waterhemp or palmer amaranth
[00:04:25.430]coming up in this plot.
[00:04:27.410]And we had some grass weeds,
[00:04:30.970]which are control very well
[00:04:32.320]by using glyphosate post-emergence
[00:04:35.100]at 32 fluid ounces per acre.
[00:04:37.280]So overall, again, this is also very good
[00:04:39.353]with control program that you can consider.
[00:04:42.390]It has at least four different herbicide mode of action
[00:04:45.380]in this herbicide program:
[00:04:47.310]AUTHORITY MTZ applied pre-emergence
[00:04:49.200]followed by glyphosate in glyphosate-resistant soybean.
[00:04:54.730]In this plot,
[00:04:55.570]Fierce EZ was applied with XtendiMax pre-emergence
[00:05:00.200]and then post-emergence application
[00:05:02.260]of glyphosate and dicamba.
[00:05:04.530]So, again, this is a good program with at least four
[00:05:07.663]or five different herbicide mode of action.
[00:05:10.460]And we also had a good residue of corn here in this plot,
[00:05:15.910]so no any weed species I'm seeing emerging in this plot.
[00:05:22.770]And here are some symptoms of dicamba on velvetleaf.
[00:05:28.200]This is typical symptoms of dicamba.
[00:05:30.960]We applied before about 10 days,
[00:05:32.820]and it is sowing and killing this velvetleaf.
[00:05:38.250]In this plot,
[00:05:39.083]Boundary and FirstRate was applied pre-emergence,
[00:05:41.920]and then TAVIUM,
[00:05:42.870]which is a premix of S-metolachlor and dicamba,
[00:05:47.900]was applied post-emergence.
[00:05:50.880]It has also provided good control.
[00:05:52.800]There were some palmer amaranth escape here.
[00:05:56.140]And, again, these are typical symptoms of dicamba
[00:06:00.140]on palmer amaranth.
[00:06:03.150]Some of palmer amaranth was relatively tall,
[00:06:05.200]but they are still showing symptoms,
[00:06:07.640]and eventually they will die in about a week or so.
[00:06:10.930]So it's a slow-acting herbicide,
[00:06:12.840]but, yeah, it will provide good control of palmer amaranth.
[00:06:16.930]Particularly, dicamba applications has been very common
[00:06:20.520]in dicamba-resistant soybean
[00:06:22.480]because we have at least six weeds in Nebraska
[00:06:25.270]are glyphosate-resistant,
[00:06:26.660]including waterhemp and palmer amaranth.
[00:06:30.010]So using dicamba post-emergence
[00:06:32.190]can provide effective control.
[00:06:33.720]However, relying only on dicamba will not help
[00:06:36.690]because dicamba-resistant palmer amaranth
[00:06:40.170]has been confirmed in Tennessee,
[00:06:42.110]and we are also getting complaints from growers
[00:06:45.270]about relatively less control
[00:06:47.550]of palmer amaranth using dicamba.
[00:06:49.940]So we, again, need to find out
[00:06:52.910]some other herbicide alternatives
[00:06:54.800]and need to avoid using the same herbicide again and again.
[00:06:59.960]This is Enlist soybean trait.
[00:07:03.540]We applied Authority Edge,
[00:07:06.190]which is a good premix of sulfentrazone and pyroxasulfone.
[00:07:12.270]It provides really good control
[00:07:13.810]of waterhemp and palmer amaranth.
[00:07:16.300]We applied pre-emergence.
[00:07:17.610]And then this plot has post-emergence application
[00:07:21.330]of Anthem MAXX,
[00:07:22.840]was mixed with Enlist Duo,
[00:07:25.430]which is a combination of 2,4-D choline and glyphosate.
[00:07:31.450]And you are seeing some leaf cupping here
[00:07:33.300]because, as I told you, this is Enlist soybean,
[00:07:35.810]and these are some leaf cupping are from dicamba.
[00:07:38.820]These are very typical symptoms of dicamba
[00:07:41.680]if soybean is not resistant to dicamba type of herbicide.
[00:07:47.010]So, we are seeing those symptoms here,
[00:07:50.210]and these are just cosmetic.
[00:07:51.840]In most of the cases,
[00:07:53.890]dicamba of target injury do not cause yield reduction.
[00:07:57.990]So the take-home message from this project
[00:08:00.150]is we do have herbicide-resistant weeds.
[00:08:03.830]And in soybean particularly,
[00:08:05.320]we have limited effective post-emergence herbicide option.
[00:08:08.970]So what we have seen here is to start
[00:08:11.260]with a very good pre-emergence herbicide that can have
[00:08:14.440]at least three different mode-of-action herbicides.
[00:08:18.590]And then a pool of application of either dicamba
[00:08:22.560]if it is dicamba-resistant soybean,
[00:08:25.030]or Enlist One or Enlist Duo if it is Enlist soybean,
[00:08:28.790]will provide very effective control
[00:08:30.700]of majority of broadleaf or grass weed species
[00:08:34.920]that we do have most common in corn and soybean production.
[00:08:38.430]So I believe we have herbicide programs
[00:08:41.170]that can provide effective control.
[00:08:42.860]You just need to apply them at right time,
[00:08:45.480]and then consider using multiple mode of action
[00:08:48.900]in your overall herbicide program.

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Soybean Herbicide Program Comparison

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