Shoot me

[Alpine Naturescapes]

OK. No picture (yet). I have a weed that won't die. In customer's lawn. At first glance it looks like a young common mallow. There is a common low growing weed that has a sky blue summer flower, that I think it is related to, but leaf gets bigger on this one. It is not groundsel. 24D/trimec stuff doesn't touch it. Triclopyr doesn't kill it either. RU will kill it back, but it keeps popping up esp between cracks in new sod, and of course ruins the lawn, which is why customer called me. He has already resodded a lot of lawn. Options?

[lorenzo piedra]

Is this the pest in question:

[Alpine Naturescapes]

Can't see your second picture, but no it's not violet. The leaf is much smaller - maybe gets up to 1/2 inch long but has scalloped edges. I have never run across this weed before, and I do a good number of apps. What is your chemical of choice on violet? Another chemical to try, or give customer his $ back? Thanks

[hardboiled]

If it has round leaves like mallow without the folds, scalloped edges, long trailing runners that are square shaped (in the mint family). I would say creeping charlie, aka ground ivy. A little tougher to treat than most, as are wild violets.

[theweedman]

sounds like it could be ground ivy.

Can't see your second picture, but no it's not violet. The leaf is much smaller - maybe gets up to 1/2 inch long but has scalloped edges. I have never run across this weed before, and I do a good number of apps. What is your chemical of choice on violet? Another chemical to try, or give customer his $ back? Thanks

[lorenzo piedra]

Check the label of Confront. More than one appplication is needed.

[Alpine Naturescapes]

Thanks, but I don't think Confront will do it. About 1/2 triclopyr. The other 1/2 is more effective on woody weeds like sowthistle etc.

[hardboiled]

I've read you need a combo of 2,4-D, MCPP, and dicamba.

[Alpine Naturescapes]

For those interested -- I will go back to see if this weed is creeping charlie, and if not, I will take a picture. If it is creeping charlie, I've done the right thing. An app of triplet and an app of triclopyr about 2 weeks apart in the fall. The only other time effective against this weed is in the spring WHILE IT IS FLOWERING. After that it forms a waxy coating on the leaves, that makes it fairly impregnable against the low doses of herbicides necessary not to kill the lawn. we don't really have a creeping charlie problem here. I guess because we are really a desert. Next I will advise customer to stop watering the lawn.

[Ric]

For those interested -- I will go back to see if this weed is creeping charlie, and if not, I will take a picture. If it is creeping charlie, I've done the right thing. An app of triplet and an app of triclopyr about 2 weeks apart in the fall. The only other time effective against this weed is in the spring WHILE IT IS FLOWERING. After that it forms a waxy coating on the leaves, that makes it fairly impregnable against the low doses of herbicides necessary not to kill the lawn. we don't really have a creeping charlie problem here. I guess because we are really a desert. Next I will advise customer to stop watering the lawn.

LI 700 made by Loveland Chemical is a surfactant that will help herbicides penetrate the waxy leaf surface.

[hardboiled]

If it is c.c., you might be interested in reading this. It may be back.

http://www.extension.umn.edu/info-u/plants/BG522.html

[Alpine Naturescapes]

HB, Don't get caught doing that.

I use Wilbur-Ellis' standard surfacant. What, if anything, about LI 700 makes it better?

[hardboiled]

[QUOTE=Alpine Naturescapes]HB, Don't get caught doing that. QUOTE]

You're right. Each person should check with their state about it's legality before using it. I thought I remembered it being discussed as an option in turf class, could be wrong. I've only used it at home here, and would check it out further before using it on a customers property. I apologize for giving bad advice.

[Ric]

Hardboiled

Yep there is a household product that does Crab Grass the same way. But once again it is not registered with the EPA, therefore big fines are possible. You must watch University websites. The PhD is not alway concerned with pesticide laws. They are trying to research new things and although they work great No one will registered them because they can not make money as in the case of Borax. I know of a Golf Course that followed a State University's advise and ended up with a $ 10,000 fine.