I know this has probably already been asked but here goes:

I'm planning on spraying food plots with glyphosate this coming weekend and of course, it's calling for 80% rain. So, how long does the chemical need to be on the plant before it rains to have a good kill.

What is your ratio? 2 oz per gal? Do you like to make it hotter in 2.5 oz per gal?

How many gallons per acre do you spray?

I'd love to hear thoughts on spraying gly on food plots from different people.

Thanks y'all!!

About 30 minutes.

If just grass, 2 ounces will do fine.

Mine usually winds up being about 15 GPA.

Your good after 30 minutes. Add a little dawn to it . Seems to help.i sprayed 10 days ago and it rained an hour after and it's dead. Mixed it 2 Oz to the gallon

2 to 3 oz per gallon (2 quarts per acre), 15-25 gallons per acre and as others have said 30 minutes is plenty of time.

the more water you put out per acre the better (up to a certain point) but if you don't have a big tractor sprayer 15 gallons per acre should work.

Thx guys. Great answers! You're consistent with what I found out when I did a search on Bing regarding the rain.

I like 2.5 oz per gal and I'm shooting for around 20 gal per ac, or a number just under 20 gals.

Good stuff guys and thanks again!

X2 on dawn or any brand. it helps dissolve the dirt and dust off leaves and helps
glyphosate stick to it.

You just make that up? Removed dust and dirt off the leaves??? How about it just helps increase surface tension on waxy leaf surfaces. That's what a surfactant does and dawn doesn't do what a quality non ionic surfactant plus ammonium sulfate does.

Yeah I'm going with 257 on this one.

no i did not make that up, i said dissolve dust and dirt, not remove.
i worked for Scotts for many years and was taught that by their management.
you are right about the waxy leaf surfaces.
my neighbor has been a horticulturist for over 30 years and told me the same thing.

Good conversation...im always learning from this site...thanks

Ummm ok

It may "also" do those things, but the reason people add surfactant of any kind is to decrease the surface tension so the water will still better and not bead.

i will take you word for it.
they both went to Auburn, so they could be wrong. would not be the first time.

Doesn't Round-Up have surfactant in it?

It does but it never hurts to load it with more.

I always thought surfactants worked to decrease surface tension which allowed better penetration

Yes I typed it wrong while I was thinking.

What about adding a little crop oil to the tank too? Any downside to that?

The only time I've ever used crop oil was when spraying thick waxy leaf vegetation. And that was in the Carolinas. Sprayed a bunch of it in the Green Swamp in NC. Saw my closest helicopter crash on that trip, also.

No real problem PCP but non ionic is way better performance wise.