Round up question

I sprayed some round up Sat, today Sunday it is raining. Will the water wash off the round up? Also will round up hurt to spray in the dog yard? Thanks Stan

Id be more worried about the temp. Herbicides dont work well when it is cold. Dont think the rain will hurt. Dont think it will hurt the dogs but would keep them off the sprayed area for awhile anyway. Reading the label may be the best advice.

my experience as long as it dried on it will work. I've sprayed at noon and had rain at supper and it worked. Maybe not perfect. As to temp I agree it has to be warm but I combat chickweed in my aspargus constantly and that stuff grows under the snow. Last year I got a final kill in November when it was only in the 50's. I always thought "if its green RU will kill it". My dog runs in it and she's fine. Heck, they routinely soak our grain crops in it.

Needs to be warm for Roundup to work. On a cool day the plant isn't active enough to pull in the Roundup. 70 degrees or above is best. A cloudy drizzly day won't be a good time to spray. Roundup doesn't work as well in very hot 95 or above because the plant is shut down trying to preserve itself from the heat. Regular old Roundup (glyphoste) will wash off within two hours of application. Roundup Weathermax or now Ultramax is supposed to be rain safe within a half hour, or so I've been told.

I have had it work pretty good when it rained 40 minutes after spraying.

At the proper application rate I'd hardly call the amount used on an entire area enough to SOAK a grain crop. Is it used when there is even any grain formed yet?

My thoughts are that glyphosate is to be used on actively growing vegetation. Where is that this time of year at the current temps? Sorry, can't place where you live 37 Chief.

Keep the dogs off any roundup sprayed area for at least a week. Keep them 50 yards away from the area you are spraying. They are very susceptible to the spray , more than you are. Think of it as poison mustard gas in WWI for your dogs!!!!!

Gordo

Don't know where you are certainly too cold to do anything 'here', it don't work well below 45 or 50, the plant needs to be actively growing for that product to work. I'd think you are kinda wasting time spraying now unless you are in southern Texas or Florida in a warm spell?

Typically after an hour it's good to go, rain won't matter. Some lables might say 8 hours....

For the dog yard, you'd want to wait for it to dry up before putting a dog back in. Read the label on your particular product, it might say 8 hours or 1 day or something? I'd maybe follow the grazing restrictions if you can't find something more applicable.

Roundup will glue itself onto clay particales as soon as it can, and so it doesn't affect much else once it hits dirt. Just binds itself up.

Lot of people have different opinions of spray safety, this is all kinda based on what the experts say, other's milage may vary.

--->Paul

Never mind, I saw your location post below 37 Chief, and yes I expect you certainly would have warm enough temperatures for spraying actively growing vegetation.

I heard a spray expert say one time you could drink a gallon of roundup and the only thing that might happen is you drown.

Stan, The Rule of thumb is this.....
As long as the spray (roundup) has dried on the plant usually 1 hr or so you are good, No wash off, if it hasn't dried it will wash off. Hope this helps.
Later,
John A.

He will not be around try it the 2nd time

I dislike it when folklore is spread, with no attribution of source, in a scientific argument. Here is the source that gives the straight dope on
Roundup

Depends on the formulation, strength of the product, and growth habit of the target plant. Generally, this time and temperature of year, I would say the roundup will give poor results, regardless of the rain.

I thought I seen the other day where you live North of San Diego so I think you are good temp. wise. I've had it rain a couple of hours after application and still work good. Like one post said, as long as it dries on the plant it will work. I mix a little crop oil in mine to help it stick to the plant. If I was to use it on the dog pen I think I would keep the dog out of the pen for a while. I don't think I wouldn't want to take a drink of roundup though, even if I just had to worry about drowning.

You know, I got to thinking about this a bit, and there could be another variable to this. In the farming community there is more to applying herbicides than just pouring it in the tank and spraying it on. When we farmers spray a herbicide on our crops we use the minimum amount it will take to kill the weeds. We also add products to help spead the droplets out and make it easier for the plant to absorb. This is for both economical purposes and to protect the crop we are spraying it on. Too much herbicide will kill or stunt our crop which translates to killed or stunted income for the whole year. When the minimum effective amount is applied, a glitch in the weather can render it ineffective really quick. The easily killed weeds will still die but the tougher ones won't and even can become resistant.

Roundup sprayed on our crops here in Iowa is applied at the rate of 24-32 oz per acre,give or take a little. A person applying it to a non-crop area might be putting it on at 60, 80, or who knows how many ounces. When an excess amount is sprayed it becomes more weather proof. The person who isn't very scientific about it, like I am when I spray fencerows with 2-4D, doesn't really know how much is going on the plant. Jim

Roundup shouldn't hurt your dog.

If the plant is actively grow'n it will work as long as the spray has had time to dry. (Few hours at the most)

Good luck.

Dave