Below, we have provided you with some information to help you choose and mix your herbicides.
| Chemical | Lb/acre (active ingredient) | Time of Application | Remarks and Limitations |
| Surflan (oryzalin) | 2 to 4 | Apply to weed-free ground. Usually apply early spring | Use lower rate on lighter soils (sandy soils) |
|---|---|---|---|
| Simazine (princep) | 2 to 4 | Apply if you have weed with 2 to 4 inches high. But best apply late fall or early spring. | Use granular formulation. Use low rates in young plantings (12 mo to 3 years.) Use lower rates on lighter soils (sandy soils). Very effective if followed by paraquat 1/2 lb/acre in the spring. Apply only once a year. |
| Roundup Ultra (glyohosat) | 1 to 3 | Can kill almost every annual and perennial weed. For maximum benefit, apply when weeds less than 6 inches tall. | Will not prevent annual weeds from coming up again from seed. If weeds have been mowed or tilled, do not treat until plants have resumed active growth. |
| Gramoxone extra (Paraquat) | 1/2 to 1 | Apply during the year as needed and when weeds are greater than 4 to 6 inches high for maximum benefit. | Do not allow spray to touch foliage of trees. Do not spray high on the trunks of newly planted trees. |
| Chemical from the bottle | 1 gallon | 4 gallon backpack | 40 gallon/acre |
| Surflan (oryzalin) | 2 to 4 oz | 8 to 16 oz | 5 to 10 pints |
|---|---|---|---|
| Simazine (princep) | 1 to 1 3/4 oz | 4 to 7 oz | 2p 3 oz |
| Roundup ultra (glyphosate) | 1 1/3 to 1 3/4 oz | 5 1/3 to 7 oz | 3 p 5 oz to 4 p 6 oz |
| Gramoxone extra (Paraquat) | 1/2 to 1 oz | 2 to 4 oz | 1p 6 oz to 2p 11 oz |
Pounds per active ingredient (a.i.) per acre