Corn Herbicide Program Comparison

Amit Jhala Author

07/08/2021 Added

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Corn Herbicide Program Comparison, Field Day, June 2021

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[00:00:00.166](upbeat music)
[00:00:06.220]Similar to soya bean, we have a demonstration project
[00:00:09.790]to represent different herbicide programs
[00:00:12.140]from different companies for overall weed management
[00:00:15.470]in corn.
[00:00:17.480]And this the idea is just to provide some unbiased
[00:00:20.070]comparison between different herbicide portfolio
[00:00:22.680]and then growers can choose which one they want
[00:00:25.550]to select based on their requirement.
[00:00:29.680]So, in this plot, for example, this is untreated control.
[00:00:32.850]We have a lot of Palmer amaranth in this plot
[00:00:36.820]and this is also a good example,
[00:00:39.100]if you do not do any weed control in your corn field,
[00:00:43.050]this is how competition it will provide,
[00:00:45.460]It will take over almost entirely by this weed
[00:00:49.430]because Palmer amaranth is very competitive weed.
[00:00:52.620]And the problem is, it is also a very prolific seed
[00:00:55.960]producer a single female plant of Palmer amaranth
[00:00:58.680]can produce somewhere between 200,000 to 500,000
[00:01:03.990]seeds per female plant.
[00:01:06.360]So, it is very competitive and controlling
[00:01:10.350]this Palmer amaranth is very important,
[00:01:13.010]particularly in corn and soybean production.
[00:01:15.590]In addition, we also have Palmer amaranth populations
[00:01:20.250]in Nebraska resistant to number of herbicides
[00:01:22.840]including Atrazine and Glyphosate
[00:01:24.820]which are very commonly used herbicides
[00:01:27.240]in our corn production.
[00:01:28.590]So, we have number of treatments here to show how best
[00:01:33.000]you can control Palmer amaranth and Waterhemp
[00:01:35.790]and giant ragweed and some grass weeds such
[00:01:37.950]as barnyard grass, foxtails and fall panicum
[00:01:41.430]by using these different herbicide programs in corn.
[00:01:45.410]This is one of the best herbicide programs in corn.
[00:01:48.480]Resicore was applied pre-emergence at two quartz per acre
[00:01:51.920]and then it was followed by a mixture of Impact and Tough
[00:01:57.230]which is also a very good post-emergence corn herbicide.
[00:02:02.000]And we are seeing really very good control of majority
[00:02:04.880]of the weed species.
[00:02:06.903]Particularly, we have a lot of Waterhemp and Palmer amaranth
[00:02:10.720]and this herbicide program has provided
[00:02:13.750]at least four different mode of action as well as
[00:02:17.683]control of majority of the broadleaf and grass weed species
[00:02:20.760]that are very common here.
[00:02:23.260]So, this is, yeah very good herbicide program to consider.
[00:02:27.430]In this program, Amthem Maxx was mixed with Callisto
[00:02:30.820]and Atrazine and it was applied pre-emergence
[00:02:33.080]and then it was followed by a post-emergence application
[00:02:36.660]of Glyphosate.
[00:02:38.010]So, this program has also provided excellent control
[00:02:41.470]of Waterhemp, Palmer amaranth
[00:02:43.050]and some giant ragweed population that we do have here
[00:02:46.570]at South Central AG Lab and this program also contains
[00:02:50.600]at least four different herbicide modes of action
[00:02:53.310]applied pre-emergence and then a single application
[00:02:56.010]of Glyphosate may not provide very effective control
[00:02:59.260]if you have Glyphosate resistance weed.
[00:03:00.840]So, in that case, you may need to consider some alternate
[00:03:03.620]herbicide to be applied post-emergence in corn.
[00:03:07.660]In this plot, Lexar EZ was applied pre-emergence
[00:03:10.870]and then it was followed by Halex GT
[00:03:13.830]which already has the Glyphosate in it was mixed
[00:03:17.130]with Atrazine and it was applied post-emergence
[00:03:20.170]and it has really provided excellent initial control
[00:03:23.750]of weeds at the time of emergence,
[00:03:25.890]as well as a good post-emergence activity
[00:03:29.240]for control of some existing weeds.
[00:03:30.920]So again, yeah, one of the best programs here
[00:03:34.310]for corn to consider especially if you have an issue
[00:03:37.250]with Glyphosate resistant weeds such as Waterhemp
[00:03:40.757]and Palmer amaranth.
[00:03:42.880]In this plot, you are seeing number of weeds
[00:03:44.880]are present very thick and it has provided very
[00:03:48.750]tough competition with corn that you can see
[00:03:51.240]with comparison with another plot
[00:03:53.500]where pre-emergence herbicide was applied.
[00:03:55.280]So, only reason is this plot has not received
[00:03:58.440]any pre-emergence herbicide.
[00:04:00.320]We applied post-emergence herbicide before 10 days.
[00:04:04.160]However, it was too late to control particularly
[00:04:07.430]this Palmer amaranth which was already like about
[00:04:10.120]10 inch tall at the time of post-emergence herbicide
[00:04:13.230]was applied.
[00:04:14.170]So, for example, this weed.
[00:04:16.520]So, it has provided some symptoms on Palmer amaranth
[00:04:20.420]but I'm sure this plant is not going to die completely
[00:04:24.140]and after a week or so it will start producing
[00:04:27.430]some new branches from the bottom
[00:04:29.720]and this is why we recommend to start
[00:04:32.050]with a very good pre-emergence herbicide at planting
[00:04:35.100]and then consider one more post-emergence herbicide
[00:04:37.980]application in corn production, because otherwise,
[00:04:40.800]if we rely only on post-emergence herbicide like here,
[00:04:44.640]it is unlikely to provide very effective control
[00:04:47.210]and during that one month period time,
[00:04:50.350]weeds already have provided enough competition with corn
[00:04:54.010]that will not provide optimum yield.
[00:04:57.070]So in this plot, Fearless was applied pre-emergence
[00:05:00.100]and then it was followed by Katagon with Atrazine
[00:05:03.470]applied post-emergence.
[00:05:04.740]And again, you are seeing very good level of weed control.
[00:05:07.760]And again, this is because of the pre-emergence herbicide
[00:05:11.330]was applied within couple days after planting corn
[00:05:14.810]that has provided excellent control.
[00:05:17.930]And then, there were some weeds present, for example,
[00:05:20.760]there are some grass weeds where there
[00:05:23.250]as well as some broadleaf weeds such as Waterhemp
[00:05:25.940]have started emerging after three weeks
[00:05:28.430]of applying pre-emergence herbicide
[00:05:30.010]and it was easily controlled by a post-emergence herbicide.
[00:05:33.090]So, this was a good comparison when you do not apply
[00:05:36.010]pre-emergence herbicide
[00:05:37.060]and if you apply pre-emergence herbicide
[00:05:39.060]and then a follow up application of post-emergence herbicide
[00:05:42.590]can provide effective and season long control
[00:05:46.100]of majority of broadleaf and grass weeds
[00:05:49.090]that we do have in corn production in Nebraska.
[00:05:52.480]So, this was just a take home message is kind of same
[00:05:55.370]as soybean project that I have discussed,
[00:05:57.610]we have number of herbicide options are available
[00:06:00.560]but weed control is all about timing
[00:06:02.650]so you need to apply a very good pre-emergence herbicide
[00:06:05.750]at planting.
[00:06:06.730]And then, that will be the best way for controlling majority
[00:06:10.220]of herbicide resistant weeds that we do have in Nebraska.

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Corn Herbicide Program Comparison

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