Slective Herbicide Killed Grass

[BillyRgn]

I am a LCO offering maintence and installations, i do not offer fertlizing or chemical treatments. i went to home depot to get a herbicide to kill the dandelion's, clover, crabgrass and some chickweed that i have in my yard. the one i picked out is called Spectracide Weed Stop plus Crabgrass Killer concentrate.. the description reads as follows "Spectracide Weed Stop for Lawns Concentrate plus Crabgrass Killer is a selective herbicide that controls emerged broadleaf ang grass weeds established lawns." i mixed it correctly acording to the chart in the directions , and used a shindiawa back pack sprayer. i sprayed the necesary areas, about a day or two later you could tell that it was working, the weeds were wilting, but then about four days latter the grass started to get a little yellow, and then about 7 to 10 days latter, whare ever i sprayed, everyting was dead, it lookedd just like round up. heres a list of ingredients.
Active Ingredients:
2,4-D, dimethylamine salt.....7.27%
Quinclorac.........................3.49%
Dicamba, dimethylamine salt..0.84%
Sulfentrazone.....................0.42%
Inert Ingredients..................87.98%
Total......................100.00%

This Product Contains:
0.52 lb 2,4-dichloropenoxyacetic and equivalent per gallon or 6.04%
0.30 lb 3,7-dichloro-8-quinolinecarboxylic acid per gallon or 3.49%
0.06 lb 3,6-dichloro-o-anisic acid equivalent per gallon or 0.70%
0.037 lb N-(2,4-dichloro-5-((4-(((difluoromethyl)))-4,5dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl ))pheny)methanesulfonamide per gallon or 0.42%
Isomer Specfic by AQAC Method

did i do something wrong, was i suposed do use something else???

[jbturf]

what else has been in your sprayer?

[hmartin]

What are the mixing directions?

[LushGreenLawn]

How did you determine that you were spraying the correct amount per 1000 sq ft? Is there a way to calibarate your sprayer, or did you eyeball it?

[prizeprop]

what else has been in your sprayer?
Thats what I was thinking also.Must not use the same tank as you previously used a non selective mix in. I learned that the hard way years ago and had the same results as the poster.

[Jason Rose]

What type of turf did you apply it on? Fescue, bermuda?

Generally you have to be cautious with "crabgrass killer" type chemicals, as crabgrass is so close in relation to fescue and other turf grasses, it's hard to kill the crab and not injure the desired turf. Not to say that you can't kill crab that way, but you have to be careful with your app. rates.

Are we talking totally brown dead, or just some yellowing of the top? Sounds like you may have over applied, even though you may have mixed it at the proper ounces per gallon, maybe too much volume of mix to cover the area. Just a guess...

[MDAutry]

I dont always use the full amount that the directions state, water it down a bit when attacking crabgrass...

[FdLLawnMan]

My opinion is that with the Quinclorac, or Drive as it is commonly called, in the mix, you over applied it. To much Drive will wack all the grasses. That is why calibration is so important.

[RigglePLC]

In my opinion you probably overdosed with the solution--and the culprit is probably sulfentrazone. I injured some grass with sulfentrazone last year--although it was a minor spot or two. Find out how many square feet one gallon of water will cover on cement. Then mix according to the square feet covered. When doing the actual application--just wet the weed--do not soak it double over. Today's mixes are more complex and not forgiving like the old Weed B Gone solutions.

[Mscotrid]

Applicator Error..

[BillyRgn]

i eyeballed it, but i didn't't really think i was using to much, kinda just gave it a quick mist, i didn't't think that something from home depot would have been this strong, the grass is totally dead and is disapearing, tomorrow i'm putting some top soil over the dead areas and reseeding them, the lawn is mostly a mixture of vibrant perennial ryegrass, gulf annual ryegrass, boreal creeping red fescue and Kentucky bluegrass.

[Runner]

Depending on how much topsoil you are going to use, you're PROBably not going to grow any grass there for awhile....Atleast a good month or so,...depending on how much water you can put down through it over the next few weeks.

[RigglePLC]

Gulf annual rye, Boreal red fescue--very cheap seed--good mixture in the 1960's. Save up your pennies and overseed with some Scotts "Pure Premium" or Lesco "Athletic Blend". Top quality seed will be darker green and more disease resistant.