Q: "Surflan can be sprayed over many plants without harming them"
A: Not if you mix it with Roundup.

Q: "What would be the consequences if it was applied too heavy?
A: You wouldn't be following the label directions. Less than stated is permitted, more than state isn't.

Q: "Would there be an environmental concern?"
A: Yes. You would be exceeding the amount stated on the label, a legal document.

Q: "Does it lose its effectiveness if rain does not come for a few days or weeks after it has been put down? ... I have too large an area to irrigate it into the soil"
A: Then you need to time the application with an expected rainfall, just as the label states.

I can find nothing about "Oryzalin, 3,5-dinitro-N4N4-dipropylsulfanilamide" the active ingrediant in Surflan to lead me to believe it is something i would want to add to my environment.
There are much less expensive and more envrinmentally friendly measn of "weed" control.

Label, what's a label?

Jean, I am well aware of what the label states and I plan on compling with it. So, please relax!

Obviously,you have no experience with using the product or you would know the application rate has a wide range of variance and that you figure that rate by calibrating your personal sprayer. Human judgement and common sense is used to do this, so probably no two people would come up with the same rate of application.

My questions were addressed to someone who has experience using the product, not opinions.

Kimmsr, I appreciate you taking the time to respond with facts. But, what is it about the active ingredient that makes you not want to add it to the environment? What harm does it cause?

Scientists use it to double chromosomes.

http://members.tripod.com/~h_syriacus/tetraploidy.htm

Also, see link below.

Here is a link that might be useful: Google Scholar link for surflan

Preem does the same thing.

Here is a link that might be useful: link for Preem

'Twas said "calibrating your personal sprayer. Human judgement and common sense is used to do this, so probably no two people would come up with the same rate of application. "

Umm, it's like this. Calibration is a specific process so that all persons applying the same dose will get it right.

Univ of Missouri
Calibration for field sprayer
http://extension.missouri.edu/p/G1270

Another for calibrating & calculating herbicide rates
http://www.extension.umn.edu/distribution/cropsystems/DC3885.html

Now, Calibrating home use sprayers for pesticides --
Calibrating Hand-held and Backpack Sprayers for Applying Pesticides
http://pubs.ext.vt.edu/456/456-502/456-502.html

You'll find lots more if you search for "calibrate pesticide home sprayer" or "calibrate pesticide agricultural sprayer" -- no quotes -- use phrase which describes your needs.

Oh yeah. I've taken pesticide training, was certified in CA, and have taught the classes.

Any other questions?

"Homology-modeled ligand-binding domains of medaka estrogen receptors and androgen receptors: A model system for the study of reproduction"

http://www.sciencedirect.com/science/article/pii/S0006291X09000850

AND

"Surflan� and oryzalin impair reproduction in the teleost medaka (Oryzias latipes)"

http://www.sciencedirect.com/science/article/pii/S0141113606001668

Hoseman: I've never used it so really can't answer your questions, however here are a few things I've found about these things.

If the label says it will control weeds for 4-6 months, then it probably won't harm anything you seed 12 months after application. However, if the label lists extended replant intervals on some crops, it will have some residual that these sensitive plant families will be damaged by, even if nothing else. I can think of one herbicide that you can generally plant 12-18 months after application, except sugar beets which need 3-4 years.

If you don't get 1/2" or so of rain during the recommended interval after application or live where rain is sparse or unreliable, you can do a shallow incorporation to get the same effect as rain. This would mean to stir it into the top 1-2 inches of the soil.

My objection to the active ingrediant in Surflan is that it appears to adversly affect our genetics.

One of the original questions asked was:
"Would there be an environmental concern?"
-------------------------------------
Then later: "But, what is it about the active ingredient that makes you not want to add it to the environment? What harm does it cause?"
--------------------------------------
H. Kuska comment. There are chemicals that will cause health problems immediately. These are easy to test for. But, there are also chemicals that could cause problems in 20 to say 60 years. How does one handle these? One has a choice. One can be a "beta tester" on what harm it may cause in the long run; or one can apply the precautionary principle when science indicates that there is a possible "tip of an iceberg" question about its safety.

Here is a link that might be useful: link for PAN info

I bought a 2.5 gallon container of Surflan last year, then DH sprayer broke, so I didn't use it. I have a bumper-crop of sandburs in the lawn this year and I want to use it now, with a hose-end sprayer. BUT I lost the Surflan instructions! Can anyone tell me what the surflan-to-water ratio is? The label says it contains Oxyzalin 3.5 (41%, with inert ingredients 59%) My lawn is a mess, I've got to keep these stickers from sprouting next year! Any help is appreciated!

Bad Acres: Go to this site and search for the brand name. You will get a new label you can print out.

http://www.cdms.net/LabelsMsds/LMDefault.aspx?t=1

Thanks Beeone! I printed the label, so now I can try to calculate the ratio of Surflan to Water. That is a good start! Much appreciate the info!!!!

People sometimes wonder why I so strongly oppose the use of most of these unnecessary "weed" controls or killers and it is simply because we have around us 8 EPA superfund sites that are cleaning up after chemical companies dumped their waste and it has contaminated the groundwater. We were assured by the chemists that dumping that waste would not be a problem and what they did not say was that these chemicals they dumped mixed together, a synergistic effect, and created a much more dangerous chemical then either one was before, so now 50 years later the EPA is still pumping out the groundwater, filtering it to remove the contaminanats, and then sending it out at great expense to you and me.
Every one that applies one or more of these poisons is poisoning the water I drink and potentially adversly affecting future generations. Keep in mind that all the water we have right now is all the water we will ever have, no more is being made and we recycle every bit of water. Any of the water you use has been recycled many times. Cosing your eyes or mind to that does not make it any less true.