2,4-D Amine Weed Killer

Will 2-4D kill Poa Annua on northern fescue grasses?

2,4-D Amine Weed Killer's label only states "This product is recommended for numerous broadleaf weeds and certain 2,4-D susceptible woody plants without injury to most established grasses". Therefore, it is probably safe to use on fescue grass, however we recommend to apply the product to a test square if you are uncertain.

2,4-D Amine Weed Killer is not labeled for controlling Poa Annua, so we are unable to recommend it for controlling that. A [artial list of weed controlled by this product can be found on the label here.

Can 2,4 d be used on tall fescue grass?

2,4-D Amine Weed Killer's label only states "This product is recommended for numerous broadleaf weeds and certain 2,4-D susceptible woody plants without injury to most established grasses". Therefore, it is probably safe to use on fescue grass, however we recommend to apply the product to a test square if you are uncertain.

Ok for Bahia grass?

The label for 2,4-D Amine Weed Killer only lists precautions for use on Bentgrass, St. Augustinegrass, Carpetgrass, Centipedegrass, Dichondra, and Clovers. Therefore we can recommend it for use on Bahia Grass. More information on the product can be found on the label present on the product page, or here.

Will it kill the grass

It depends on the grass that it is used on, but the label says injury to the grass may occur if applied to Bentgrass, St. Augustinegrass, Carpetgrass, Centipedegrass, Dichondra, and Clovers.

What ratio do I use on my lawn to kill chickweed and not hurt my lawn?

It depends on what type of lawn you have, so it is hard to tell how much is too much. 2,4-D Amine isn't directly labeled for chickweed, although it is in the plant family that would normally be killed by that type of herbicide. It is best to follow the label's guide for the mixing ratios as it depends on the type of sprayer you use, if this is a post-emergent or pre-emergent treatment,  and if you are only doing spot treatment or a full yard treatment.

For spot treatment, the labels suggests doing the following: Mix 2 to 3 tablespoonfuls per gallon of water and apply with a hand sprayer to control broadleaf weeds in small non-cropland areas. Add a suitable, approved surfactant to the spray mixture to insure better coverage of target weeds Do not use the same sprayer for insecticides or fungicides. 2 pints per acre per application. For moderately susceptible biennial and perennial broadleaf weeds: Use 2 to 4 pints per application. For difficult to control weeds and woody plants: Use 4 pints per acre per application. Spot treatment: Use 4 pints per acre. Maximum of two applications per year. Maximum of 8 pints per acre per year. Minimum of 30 days between applications.

For the full instructions on an entire lawn, please check the label, as it explains the mixing ratios for post and pre-emergent spraying. It also notes that injury to the grass may occur if applied to Bentgrass, St. Augustinegrass, Carpetgrass, Centipedegrass, Dichondra, and Clovers.

Is this concentrated or straight use?

This product is concentrated and depending on how it is used (on what plants it's used on, on the area of the application, etc) , the mixing ratio is different. It's always best to check the label to make sure you'll have enough for the treatment you're looking for.
On Southern Ag's website page of 2, 4-D Amine it says the application rate is "2- 3 tablespoons in 3 – 5 gallons of water to cover 1,000 sq. ft."