Does anyone have experience with this chemical? Unlike preem, it comes as a liquid. You can mix it with Roundup and use it as a weed killer and pre-emergence. This is what I have been looking for the last 10 years. I control weeds under my electric fence, around the backs of my shrub and flower borders for a buffer between them and the woods, as well as in the flower and shrubs beds. Surflan can be sprayed over many plants without harming them so it would applied before weeds germinated, late summer for winter annuals and early spring for summer weeds and grasses. Of course with adding roundup to the mix, obviously you can not spray over the flowers and shrubs.

I have a couple of questions for those who have used Surflan, with or without mixing with roundup.

What would be the consequences if it was applied too heavy?
Would there be an environmental concern? Or would the concern be a buildup in the soil, thus making the soil sterile and you would unable to till and plant in that area for a number of months or years.

How effective has Surlfan been in preventing weeds and grasses? Does the effectiveness last as long as the label state, depending on the concentration, 4-8 months?

If any of the surflan get on walkways or vinyl fence posts, does it stain and if so, is it permanent or will it wash off with the first rain?

Does it lose its effectiveness if rain does not come for a few days or weeks after it has been put down? As I understand the label it is not activated to become effective until it has been watered in. I have too large an area to irrigate it into the soil, I have to wait for rain to wash it into the soil to make the barrier.

I appreciate any help offered. The label does not answer these questions. Experience has to answer these questions.

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.

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?

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

Also, see link below.

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?

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

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.

Thanks for the information, it is most helpful. That is the kind of information I was looking for, not idealogical or esoteric information, just practical information I can use.

Again, thanks beeone.

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