Prowl H20 - when to apply and grazing restrictions

[Flash44]

I lost the booklet that came with the container, but I’m pretty sure I had to restrict grazing for 45 days after application last year on the original label. However, I looked it up online and found 3 different recommendations - 21 days, 14 days and no restriction. Apparently there was a label change. I contacted BASF but have not yet heard back from them. Does anyone know what the current grazing restriction recommendation is? Also, I’m in north Baltimore County, does anyone know when to apply as a pre-emergent to kill stiltgrass? Last year I was late, 3rd week of March, but it worked great. This year I might have to do 2 applications depending on how long I have to restrict grazing.

http://extension.psu.edu/plants/crops/news/2016/05/label-update-prowl-h2o-use-in-grass-forages
“There is no preharvest or pre-grazing interval for Prowl H2O-treated grass forage, green chop, silage, hay, or pasture.”

There is a pdf file of the supplemental label on that website. It still makes me nervous to spray and graze.

Does anyone have thoughts on exactly when to apply? I’d like to spray a few paddocks, give it a couple weeks to get rained on, then move animals around and spray those areas.

[goldenrow]

If I remember correctly, the new label does not include pasture as a labeled crop. From the way it sounds, you may already have this in your possession. But there are other, better, updated, herbicides to use on your pasture. Grazon formulas and 2,4-D’s are quite safe. I can recommend others, if you like.

Use your Prowl H2O on your asparagus, carrots, green beans, tomatoes, and potatoes in your garden instead.

[goldenrow]

Remember, Prowl H2O works just emerging weeds. So you can spray it on weed seedlings, but make sure that your other plans are already well-established, for spraying.

[ShotenStar]

I also have a major stilt grass invasion and the U of MD Extension service has recommended Prowl be applied the first week in March for maximum effectiveness on stilt grass. Stilt grass is apparently an early sprouter, therefore early application is needed.

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[ShotenStar]

i dug back into this topic because I had my pastures sprayed for stilt grass the first week in March. The mares are going slightly stir crazy being locked in the sacrifice paddock. The labeling on Prowl has changed over the years, which makes pinning down the current restrictions a little tricky – and the restrictions seem to vary greatly by the type of crop / intended use of the crop. It still looks like the 30-60 day restriction is wise, according to the rate at which the Prowl was put down. Restriction of 28 days if used at 2.1 quarts per acre or less. Restriction of 50 days if applied at greater than 2.1 quarts per acre.

Since mine was done at 2.5 q/a, it looks like the mares will hate me awhile longer.

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[NaturallyHappy]

Hi there! I recognize this is an older thread but would like to ask more about Prowl. I scanned the booklet on the website and didn’t see anything at all about horses. It may be there, but I didn’t see it. Does anyone have updated information? My farmer wants to use it in my hayfield; I am concerned about overspray. With Covid, it’s hard to reach people by phone right now. Thank you.

[Where_sMyWhite]

Your county extension agriculture agent is an excellent place to start with respect to timing and herbicide recommendations for your area

[NaturallyHappy]

Thanks- I’ve already called and left a message at my county office already. I’ve tried the university extension office, the agronomy and equine departments, my local agronomist at the mill and google. With Covid and folks working from home, communication seems to be very slow. I found a paper published by Penn State and called the author of that paper. I looked at the Prowl website and the only phone number I saw was an emergency number. It didn’t seem right to use that one, so I thought I’d check in here. Oh yes, I called the author of the paper above in TN, too.