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Central IA | Which has better grass control and/or longer residual? Using pre with acetachlor. This will be on fields that have a good bit of foxtail/crabgrass/quackgrass pressure. Will be non gmo. Should I run both? I'll be using Laudis and atz post. Like to use metribuzin on beans so I don't want to get crazy with the triazines on the corn. Thanks. |
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Lancaster, OH | Simazine is for grass. Atrazine is for broadleaves. Both are root absorbed so they need to be at or below germinating seed level to control a weed. If you are no-tilling, a combination of acetachlor and simazine is a very solid grass control approach. In this neighborhood, we would use 2# ai acetachlor, 1# ai simazine and 1-1.5 atrazine.
The atrazine rate would depend on the plan for post weed control. If we plan to use a post for some tough broadleaves, then we go with the lower residual rate. If we feel we will control them pre, then the higher rate. |
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SWOH | I used to do both, 2.1 qts of Bicep and a pound of Simazine with Roundup and 24D. Pretty good grass control as long as we got a little bit of rain. Simazine doesn’t have any burndown activity but is much better than Atrazine for grass residual.
You might have different experience than I do, but I wasn’t impressed with Laudis on grasses. Impact seems to be much better on grasses here. |
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Donnellson, IA. Makes saying here easier. | Residual will be longer with simazine. Most here is used in the fall ahead of corn with a 2 4D dicamba pass to keep fields decently clean until planting. I like both products but using the simazine pre with the atrazine post, mixed if all pre. We haven't sprayed many acres this way for awhile but all of our corn on corn will get this program this season. My chem labels are on my tablet but I would say simazine would have better grass control, we don't struggle with grass early so not something Ive logged. And on the spectrum of broadleaves it falls between small seeded like your acetachlor and atrazines large seeded effectiveness in my experiences. I have backed my atrazine down pre where not running simazine just because we struggle a lot with cocklebur late season and the higher rate of atz post really has helped that. If you fight grass later have you tried running capreno instead. Ive never used any because we haven't had the late season issue with grasses but I know with the ingredients in it the residual of grass and post activity would be extended a couple weeks. Price is more but an option. Early post here the callisto, impact, laudis clan does great if the grasses don't get a start, the rows close soon after(v4-5 pass). All from my experience. I wrote this quick and apologize for any inaccuracies I will try to load my chem experience bible later and double check. We have been really happy with our non-gmo corn and the cleanliness of fields. Have a good day.
Edited by DobsonAG 1/1/2018 19:57
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mercer county, il | I would say that I have had better luck with laudis on grasses instead of impact. That having been said we saw much better control or grasses with both running a full rate of mso and 1 gal/ac 32% instead of bean oil or surfacant and and or 32%
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SWOH | I’ve never tried 32 or 28 with either one but always use a full shot of MSO and I’ve never had issues with Impact on small grass. The two years that I tried Laudis I had a lot of grass issues. Maybe I should try a little again but I was soured pretty bad on Laudis. |
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mercer county, il | Yeah laudis calls for a nitrogen source I am not sure about impact though. We used spray grade AMS and were less than thrilled with the performance on grasses, switched to 32% and it made a night and day difference if it is hot a quart or so per acre will do it, we just got in the habit of running a gal all the time. |
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Tenn Valley | Simazine is pretty insoluble so it takes rain/moist soil to activate it and keep it in soil solution. Simazine is a better grass product with a long residual. It can impact wheat if you're planting wheat in the Fall. There have been 50+ years of atrazine + simazine applied to Mid West corn fields. |
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SWOH | Thanks for the tip, might have to try it again. |
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SC Wisconsin | Simazine will not touch quack grass. Atrazine will, but you need rates that are not consistent with typical use rates available today. Nicosulfuron is a good choice for quack but will miss smooth & large crabgrass. In my experience, simazine and atrazine for grass control is mediocre when compared to acetachlor. That said, simizine's lower solubility gives it some advantages with specific weeds by staying in the germination zone longer than ATZ. I would suggest bumping your acetachlor rates or shifting the timing. Given your concerns with using metribuzin next year, both of the triazines will increase injury risk with increasing rates. Make sure what you are running post covers the weed spectrum you have growing at the time of treatment. Many grasses will be tough to kill with Laudis/Atz if they are too big. |
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NE WI | Before use restrictions on Atrazine were in place for our area back in the early 90's dad used to use 5lbs/acre to control quack grass. Any less and it didn't work in our sandy loam soils. Haven't used it in at least 15 to 20 years when dad switched to 2/3 oz Accent and 8 oz Banvel with crop oil. Adding crop oil really smoked the lambsquarters with the Banvel. This was pre RR corn days. |
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Simazine vs atrazine
