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| Does japanese bean leaf beetle effect yield on soybeans ? seems to me I heard they aren't a real threat
sorry for poor pictures when i see things that cost me money i get shaky
And does anyone know how to control the weed in last picture grows in ditch and sneeks into fields
Edited by Gambler 7/27/2008 14:16
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The Sands Of N IN | Our good friends at Purdue University say that significant leaf defoliation must occur before an insecticide treatment is needed on soybeans, even at these high grain prices...probably a whole field of the last leaf you showed. Beetles tend to be "patchy" especially along field edges.
That weed is Scouring Rush and is actually a sedge. Almost nothing will control it and tillage through it will make it worse. Might have some luck with something like Yukon in corn.
Link to Scouring Rush info: http://www.illinoiswildflowers.info/grasses/plants/scouring_rush.ht...
Edited by B58 Hustler 7/27/2008 17:19
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Boyd, WI | The weed is known to me as horsetail. Not horseweed or marestail, but horsetail. Generally grows where water table is close to the surface by us. Best of luck to control it. I've noticed that tillage is basically the only thing to take it out for sure. It will be back again when you go minimum or no-till again. |
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Nevada, Iowa | We always called it snake grass. I did a search on snakegrass and it returned a picture of that plant as well as fact that it is more known as horsetail or horsetail grass. I don't know how to get rid of it but we may not want to. Another return on that search was from flowermart.com. They're selling horsetail at $5.95 per bunch. |
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West Union, IOWA FLOLO Farm 52175 | Bugs, I throw bug dope in when I spray Rup. and rarely have had to spray a rescue
As for the weed I've heard it called all them and have heard Gramoxone/paraquat is about the only chemical control but you'll sacrifice surrounding weeds/crop--loran |
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West Central IL | I believe it is called Scouring Rush, I have a little ina field that used to be pasture. It is very hard to kill, I can't remember which corn herbicide I was told killed it. It may have been Lightning or Yukon but I can't remember.
Edited by Angus 7/27/2008 17:22
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West Michigan | That is not horsetail. Not sure what it is but horsetial is more like a little christmas tree. Roundup will not kill horsetail or the weed that you pictured. |
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Camrose, Alberta | I am certain that the weed is Field Horsetail. Field Horsetail is a very unique plant, since it does not reproduce via seeds, but via spores. What you are seeing in the picture is the reproductive "stems" that will release the spores. You may have also seen the vegatative growth that looks like little Christmas trees and is then later replaced by the reproductive "stems."
I have field horsetail in small patches throughout my farm. I find it tends to thrive in areas that crops don't do well in, mainly wet spots. I also have a large patch on a sandy knoll so it is a well adapted weed. I beleive the best way to control it is through crop competition, since it only seems to do well where the crop does poorly. So if there is a way to improve the soil its growing in so that the crop will thrive, then that is probably your best bet. On the other hand at least it holds the soil in place from wind and water erosion in those areas.
Many different herbicides will turn it brown, but none that I know of will kill it in-crop. Gramoxone will kill it and any other vegetation it contacts. |
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| We have had some luck with casoron in the early spring when its cold to control horsetail. But that is in our blueberry road border.
http://www.uap.ca/products/documents/CasoronG-4-E-SpecimenLabel_000... |
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NW Washington | Here is a google image with "horsetail" pictures. It is also known a "scouring rush" because the stems have a lot of silicon in them and it used to be used to scour pots and pans, or so I have been told. There is a bigger variation too. They say it have on the earth since the dinosaurs and it will be here when we are gone.
http://images.google.com/images?q=horsetail%20weed&sourceid=navclie... |
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| I talked to a guy who had seen decent results using Permit to fight Horsetail, but I have no proof of the success... |
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MI | The weed is equisetum (aka - scouringrush horsetail, among others) - google it and you'll find more info. |
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MI | For the damage - typically most references I have read/heard talk about a 20% defoliation as being the threshold - but that was at 5-6 dollar beans. Jap Beetles are voracious feeders and they also lay little eggs that turn into grubs that can attack crops below ground as well.
With beans about double that - I would think the threshold would be halved...... |
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Japanese Beetle damge ? effect yield Pics
