Pigweed

[DBCooper]

You shouldn't need a surfactant with it.....although I don't know why it would 'hurt' your mix. The ammonium sulfate is to "trick" the plant into thinking it's time to feed.

Just for my education....what is the "top rate" for gly? I've mixed 13 oz/gal (41% mixture) before. I think that's about a 10% rate.

 

[brownisdown]

Have you tried the 2,4 D choline? I’m thinking about spraying it under the trees since it’s a lot less volatile.

Yes. Used some on newly sprigged Bermuda grass. It helps but not nearly as potent as amine formulas in my experience.

 

[brownisdown]

You shouldn't need a surfactant with it.....although I don't know why it would 'hurt' your mix. The ammonium sulfate is to "trick" the plant into thinking it's time to feed.

Just for my education....what is the "top rate" for gly? I've mixed 13 oz/gal (41% mixture) before. I think that's about a 10% rate.

Anything over about a 4% solution is typically wasting money unless specialized applications like stump drenching.

 

[DBCooper]

Anything over about a 4% solution is typically wasting money unless specialized applications like stump drenching.

These folks are trying to kill something (pigweed). At the proper ratio, gly will kill it. I haven't ever tried to kill non-target plants with gly....but everything I've ever tried to kill that was on label.....died (at some rate of mixture).

 

[brownisdown]

These folks are trying to kill something (pigweed). At the proper ratio, gly will kill it. I haven't ever tried to kill non-target plants with gly....but everything I've ever tried to kill that was on label.....died (at some rate of mixture).

They are not wrong in that most pigweed is glyphosate resistant to some degree. You are not wrong that it may work better at really high concentration. I'd advise a different chemical specifically for the needed application but beyond Bermuda grass applications, I can't speak intelligently about what specific herbicide that may be.

A pre M such as prowl h20 may be worth reading about in food plot applications.

 

[sky hawk]

Just wondering....why would you incorporate a pre-emergent at time of planting?

I have used the incorporated pre-emergent for years at planting time to keep weeds from sprouting. It has a long residual. For my use, a 2.5 gallon jug will last me 3 years of planting.

The past two years, I have used Clearfield with Imox also. Imox says it has "limited" residual properties. So I kept using the pre-emergent. I probably could get by without it, but I already had it, and I was trying to clear some weeds out of the field. I can say that any areas where the sunflowers don't grow thick and block out the sun, the weeds will jump around mid-July. So Imox clearly doesn't keep them away.

 

[DBCooper]

They are not wrong in that most pigweed is glyphosate resistant to some degree. You are not wrong that it may work better at really high concentration. I'd advise a different chemical specifically for the needed application but beyond Bermuda grass applications, I can't speak intelligently about what specific herbicide that may be.

A pre M such as prowl h20 may be worth reading about in food plot applications.

I don't disagree at all (get something that will BETTER target pigweed). There's some articles out there about water hardness and gly mixtures that are worth reading too.

 

[DBCooper]

I have used the incorporated pre-emergent for years at planting time to keep weeds from sprouting. It has a long residual. For my use, a 2.5 gallon jug will last me 3 years of planting.

The past two years, I have used Clearfield with Imox also. Imox says it has "limited" residual properties. So I kept using the pre-emergent. I probably could get by without it, but I already had it, and I was trying to clear some weeds out of the field. I can say that any areas where the sunflowers don't grow thick and block out the sun, the weeds will jump around mid-July. So Imox clearly doesn't keep them away.

I'm wondering how anything germinates with a PRe-M applied?????

 

[brownisdown]

I don't disagree at all (get something that will BETTER target pigweed). There's some articles out there about water hardness and gly mixtures that are worth reading too.

And you are right about a nitrogen source carrier making gly work faster.

 

[Jimbob78]

They are not wrong in that most pigweed is glyphosate resistant to some degree. You are not wrong that it may work better at really high concentration. I'd advise a different chemical specifically for the needed application but beyond Bermuda grass applications, I can't speak intelligently about what specific herbicide that may be.

A pre M such as prowl h20 may be worth reading about in food plot applications.

Pendulum works well for us through late spring but then we have to switch to valor but the weeds eventually break through.

 

[Jimbob78]

I'm wondering how anything germinates with a PRe-M applied?????

Oh it does

 

[brownisdown]

I'm wondering how anything germinates with a PRe-M applied?????

There are crop specific Pre M herbicides that target the bad seeds not the good.

 

[DBCooper]

And you are right about a nitrogen source carrier making gly work faster.

Diquat will make it work faster.... . The ammonium nitrate will trick it. I'm not really hung up on how quickly something I sprayed with gly dies.....as long as it does (die). The LAST thing I'd do is pull it up, after spraying, though.

 

[sky hawk]

I'm wondering how anything germinates with a PRe-M applied?????

selective herbicides.

 

[DBCooper]

There are crop specific Pre M herbicides that target the bad seeds not the good.

Well there ya go. These plot mixes have come a long ways.

 

[Rescue44]

This may already be known...If using ammonium sulfate(AMS), add AMS to tank and fill tank with water as full as possible before adding R up. Explanation is in link.

Herbicide How-To: Maximizing Glyphosate Activity - Oklahoma State University

An explanation of some of the subtle differences between glyphosate products that can impact procedures and important considerations when using them.

extension.okstate.edu

 

[billyf]

pigweed is tough to control. I plant non roundup sunflower or dixie lee peas or other produce in 36" rows with a pre-emerge (dual magnum). The pre-emerge gives the sunflower a 3 week or so headstart on the weeds. A rain right after planting makes the pre-emerge more effective.. After 3-4 weeks when the pre-emerge wears off I then use a 2 row rolling cultivator to take care of the weeds from there until canopy shades out the middles..

 

[Jimbob78]

pigweed is tough to control. I plant non roundup sunflower or dixie lee peas or other produce in 36" rows with a pre-emerge (dual magnum). The pre-emerge gives the sunflower a 3 week or so headstart on the weeds. A rain right after planting makes the pre-emerge more effective.. After 3-4 weeks when the pre-emerge wears off I then use a 2 row rolling cultivator to take care of the weeds from there until canopy shades out the middles..

Rolling cultivators are the most effective weed control other than a bus load of hands

 

[Rescue44]

But...pigweed can put on roots along the stem, like a tomato plant, when cultivated and covered some with dirt. It's one of the worst weeds to develop resistance. I threw on that was about 2 feet tall on a field road. A month or 2 later it wasn't dead. It had put a few roots into the hard packed dirt. Dang.

 

[Jimbob78]

But...pigweed can put on roots along the stem, like a tomato plant, when cultivated and covered some with dirt. It's one of the worst weeds to develop resistance. I threw on that was about 2 feet tall on a field road. A month or 2 later it wasn't dead. It had put a few roots into the hard packed dirt. Dang.

I’ve been pulling them and tossing them onto my middles for the lawnmower to eat if they haven’t seeded. If they have, they go in the ditch to hopefully wash the seed to Lenoir county.

 

[valetroutfisherman]

Harvest it, sell ant Heathfood outlets, the Granolas an rabbit huggers will gobcrazy over it
Fresh or dried pigweed leaves can be used to make tea. The seed is very small but easy to harvest and very nutritious. The flavour is greatly improved by roasting the seed before grinding it. Pigweed seed can be ground into a powder and used as a cereal substitute, it can also be sprouted and added to salads.

 

[Rescue44]

Harvest it, sell ant Heathfood outlets, the Granolas an rabbit huggers will gobcrazy over it
Fresh or dried pigweed leaves can be used to make tea. The seed is very small but easy to harvest and very nutritious. The flavour is greatly improved by roasting the seed before grinding it. Pigweed seed can be ground into a powder and used as a cereal substitute, it can also be sprouted and added to salads.

Say WHAT??

 

[JayR]

Harvest it, sell ant Heathfood outlets, the Granolas an rabbit huggers will gobcrazy over it
Fresh or dried pigweed leaves can be used to make tea. The seed is very small but easy to harvest and very nutritious. The flavour is greatly improved by roasting the seed before grinding it. Pigweed seed can be ground into a powder and used as a cereal substitute, it can also be sprouted and added to salads.

But do the deer like it? Sounds like that is the important question.

Also sounds like it is here to stay, being resistant to all of the herbicides and a fast spreader.

I'm on the sidelines on this, but has pigweed and its friends caused anyone to reconsider how they use herbicides overall? Plants are much more practiced than us at chemical warfare, and it seems like the wide spread use of Roundup and others is what helps the resistant strains emerge.

 

[Jimbob78]

I’d be rich if there was any value in pigweeds.

 

[Jimbob78]

But do the deer like it? Sounds like that is the important question.

Also sounds like it is here to stay, being resistant to all of the herbicides and a fast spreader.

I'm on the sidelines on this, but has pigweed and its friends caused anyone to reconsider how they use herbicides overall? Plants are much more practiced than us at chemical warfare, and it seems like the wide spread use of Roundup and others is what helps the resistant strains emerge.

It’s not resistant to all herbicides but you have to be careful with the ones that it’s sensitive to and your crop species.

 

[Rescue44]

I'm on the sidelines on this, but has pigweed and its friends caused anyone to reconsider how they use herbicides overall? Plants are much more practiced than us at chemical warfare, and it seems like the wide spread use of Roundup and others is what helps the resistant strains emerge.

Durn right resistant pigweed caused a lot of considerations!!

Also, from NCSU Cotton Information Handbook..

"Herbicides do not cause resistance. Rather, herbicides select for resistance that may naturally occur in the weed population. Greater reliance on a particular herbicide, or group of herbicides with the same mechanism of action, puts greater selection pressure on any resistant individuals that may be in the population. A shift to conservation tillage and a corresponding decrease in cultivation have led to greater reliance on herbicides and greater potential problems with resistance. "

 

[Rescue44]

I’d be rich if there was any value in pigweeds.

Something would be found wrong with it.

 

[Jimbob78]

Something would be found wrong with it.

We’d have to start spraying it with fungicides and insecticides, but in the end I guarantee it would all die.

 

[Hazmt]

We’ve been fighting chemical resistance in weeds for over 25 years on our farm. Turn your fields over with a breaking plow, then use pre-emerge herbicides, then over the top herbicides prior to canopy. Round up will not kill resistant varieties of pigweed. It differs from farm to farm for resistance. Synchrony will kill pigweed on my farm ( and it is a blend of chemicals that are ALS inhibitors). Roundup alone will not kill my pigweed. The seeds are tiny and numerous. A single plant can produce between 300-500 thousand seeds. If not addressed, they will take over quickly. Roll the soil! Then pull every single plant that breaks through and carry it to the field edge. There will be fewer after you plow. Do not
Plow again for 3-5 years.

 

[bertienchunter]

Gramaxon kills pigweed. It has to be adequately covered. If the weeds were thick like carpet, some can be protected like an umbrella, be damaged, then recover. You need to add crop oil or surfactant to gramaxon.
Forgot to mention you can spray round up for grass before sunflowers emerge, then spray gramaxon the next day. Round up needs to absorbed into the plant(grass, etc.), before gramaxon burns the plant. Not sure how long you could actually wait between the 2 chemicals. I skipped the round up.

By law you can't buy gramoxone without a pesticide license and gramoxone applicators license. Also, gramoxone does not kill systemically like round up.

24,D may be a more viable and realistic for someone with no pesticide applicators license as it doesn't not require a license (or 2).