Table 2.2-6. Relative effectiveness of "burndown" treatments for no-till corn
| This table compares the relative effectiveness of herbicides on individual weeds. Ratings are based on labeled application rates and weed size or growth stage. Treatments are rated only for control of vegetation existing at the time of application. Add preemergence herbicides (Table 2.2-10) as required for the specific situation. | ||||||
| Weed control rating: | ||||||
|---|---|---|---|---|---|---|
| 10 = 95-100% | 9 = 85-95% | 8 = 75-85% | 7 = 65-75% | |||
| 6 = 55-65% | N = less than 55% or no control |
— = not applicable | ||||
| Herbicide¹ | Alfalfa sod |
Brome- grass or quack- grass sod |
Burdock | Canada thistle |
Chick- weed |
Common4 groundsel |
Common ragweed |
Dan- delion |
Downy brome |
Field violet/ pansy |
Annual Flea- banes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2,4-D (spring-applied) 1 pt | 7+ | N | 7 | 8 | 6 | 6 | 9 | 8 | N | 6 | 6 |
| 2,4-D + Clarity (spring-applied) | 9 | N | 8 | 8+ | 8 | 7 | 9 | 8 | N | 7 | 8 |
| Atrazine | 6 | 8 | 6 | 6 | 8 | 9 | 9 | 9 | 7 | 8 | 7+ |
| Atrazine + 2,4-D | 8 | 7 | 7+ | 8+ | 8 | 9 | 9 | 9 | 7 | 8 | 7+ |
| Autumn + 2,4-D (fall-applied) | 7 | N | 9 | 6 | 9 | 8 | — | 9 | N | 6 | 8 |
| Balance/ Corvus/ Prequel | N | N | 7 | 6 | 8 | 8 | 7 | 6 | N | 6 | 7 |
| Glyphosate (fall applied)² | 8+ | 9 | 8+ | 9 | 9 | 9 | — | 9 | 9 | 7 | 8 |
| Glyphosate (spring applied)² | 7 | 8 | 7 | 8 | 9 | 9 | 9 | 6 | 9 | 6 | 7+ |
| Glyphosate + 2,4-D or Clarity (fall applied_ | 9+ | 9 | 9+ | 9+ | 9 | 9 | — | 9 | 9 | 7 | 95 |
| Glyphosate + 2,4-D or Clarity (spring applied) | 8+ | 9 | 7+ | 8+ | 9 | 9 | 9 | 8 | 9 | 8 | 8 |
| Glyphosate + Atrazine | 7+ | 9 | 7+ | 8 | 9 | 9 | 9 | 7 | 9 | 8 | 7+ |
| Glyphosate + Metribuzin |
7 |
9 |
7 |
8 |
9 |
9 |
9 |
6 |
9 |
8 |
8 |
| Glyphosate + Sencor | 7 | 9 | 7 | 8 | 9 | 9 | 9 | 6 | 9 | 8 | 8 |
| Gramoxone | N | 6 | N | 6 | 8+ | 8+ | 8 | N | 7 | 8 | 6 |
| Gramoxone + Metribuzin |
N |
6 |
6 |
6 |
9 |
8+ |
8 |
N |
7 |
8 |
6 |
| Gramoxone + 2,4-D or Clarity² | 7+ | 6 | 7 | 8 | 9 | 8+ | 9 | 7 | 7 | 8+ | 7 |
| Gramoxone + Atrazine | 7 | 8 | 6 | 7 | 9 | 8+ | 9 | N | 8 | 8 | 7 |
| Gramoxone + Sencor | N | 6 | 6 | 6 | 9 | 8+ | 9 | N | 7 | 8 | 6 |
| Harmony Extra | 6 | N | 6 | 8 | 9 | 9 | 6 | 6 | N | N | N |
| Hornet (spring applied) | 8 | N | 8 | 8 | N | 8+ | 9 | 6 | N | N | 9 |
| Ignite | 6 | 6 | 6 | 6 | 8 | 7 | 8 | 6 | 6 | N | 8 |
| Liberty |
6 |
6 |
6 |
6 |
8 |
7 |
8 |
6 |
6 |
N |
8 |
| Lumax | 6 | N | 8 | 7 | 9 | 9 | 8+ | 8 | N | 7 | 8 |
| Sharpen | N | N | N | 6 | 6 | 8 | 8 | 7 | N | N | 7+ |
| Sharpen + glyphosate | 7 | 8 | 7 | 8 | 9 | 9 | 9 | 8 | 9 | 6 | 8 |
| Valor SX | N | N | N | N | 9 | 7 | 7 | 86 | N | N | N |
| Herbicide¹ | Foxtail | Hairy vetch |
Hemp Dogbane, Dewberry, Milkweed, etc. |
Henbit/ dead- nettle |
Horseweed/ Marestail³ |
Lambs- quarters |
TR Lambs- quarters |
|---|---|---|---|---|---|---|---|
| 2,4-D (spring-applied) 1 pt | N | 9 | N | N | 8+ | 9 | 9 |
| 2,4-D + Clarity (spring-applied) | N | 9+ | 6 | 6 | 9 | 9 | 9 |
| Atrazine | 7 | 7 | N | 8 | 8 | 9 | N |
| Atrazine + 2,4-D | 7 | 9 | N | 8 | 9 | 9 | 9 |
| Autumn + 2,4-D (fall-applied) | N | 9 | N | 9 | 9 | — | — |
| Balance/ Corvus/ Prequel | 6 | 7 | N | 7+ | 7 | 7 | 7 |
| Glyphosate (fall applied)² | — | 8 | 8+ | 8 | 8+5 | — | — |
| Glyphosate (spring applied)² | 9 | 8 | N | 9 | 9 | 9 | 9 |
| Glyphosate + 2,4-D or Clarity (fall applied_ | — | 9 | 9 | 8+5 | 9+5 | 7 | — |
| Glyphosate + 2,4-D or Clarity (spring applied) | 9+ | 9 | 7+ | 8+ | 9 | 9 | 9 |
| Glyphosate + Atrazine | 9 | 8 | N | 9 | 9 | 9 | 9 |
| Glyphosate + Metribuzin |
9 | 7 | 7 |
8+ | 8+ |
9 | 9 |
| Glyphosate + Sencor | 9 | 7 | 7 | 8+ | 8+ | 9 | 9 |
| Gramoxone | 9 | 7 | 6 | 7 | 7 | 8 | 8 |
| Gramoxone + 2,4-D or Clarity² | 9 | 9 | 6 | 8 | 8+ | 9 | 9 |
| Gramoxone + Atrazine | 9 | 8 | 6 | 9 | 8+ | 9 | 8 |
| Gramoxone + Metribuzin |
9 |
7 |
6 |
8 |
8 |
9 |
8 |
| Gramoxone + Sencor | 9 | 7 | 6 | 8 | 8 | 9 | 8 |
| Harmony Extra | N | 8 | 6 | 8 | 7+ | 9 | 9 |
| Hornet (spring applied) | N | 9 | N | N | 8+ | — | 7 |
| Ignite | 8 | 6 | N | 6 | 8 | 8 | 8 |
| Liberty |
8 |
6 |
N |
6 |
8 |
8 |
8 |
| Lumax | 6 | 8 | N | 8 | 8 | 9 | 9 |
| Sharpen | N | 6 | N | 6 | 8 | 8 | 8 |
| Sharpen + glyphosate | 9+ | 6 | 7 | 6 | 9 | 9 | 9 |
| Valor SX | N | N | N | 7 | 6 | 9 | 9 |
| Herbicide¹ | Mustards spp. |
Orchard- grass or fescue sod |
Red clover |
Rye cover, volunteer small grains |
Smartweed | Timothy, blue- grass |
|---|---|---|---|---|---|---|
| 2,4-D (spring-applied) 1 pt | 9 | N | 9 | N | 7 | N |
| 2,4-D + Clarity (spring-applied) | 9 | N | 9+ | N | 9 | N |
| Atrazine | 8 | 6 | 6 | 6 | 9 | 6 |
| Atrazine + 2,4-D | 9 | 6 | 9 | 6 | 9 | 6 |
| Autumn + 2,4-D (fall-applied) | 9 | N | 9 | N | — | N |
| Balance/ Corvus/ Prequel | 8 | N | 6 | N | 6 | N |
| Glyphosate (fall applied)² | 9 | 9 | 8+ | 9+ | — | 9+ |
| Glyphosate (spring applied)² | 9 | 7 | 7 | 9+ | 7 | 9+ |
| Glyphosate + 2,4-D or Clarity (fall applied_ | 95 | 9 | 9 | 9 | — | 9+ |
| Glyphosate + 2,4-D or Clarity (spring applied) | 9 | 7 | 9 | 9+ | 8+ | 9+ |
| Glyphosate + Atrazine | 9 | 7+ | 7+ | 9 | 9 | 9 |
| Glyphosate + Metribuzin |
8+ |
N | 8 |
8+ |
9 |
7 |
| Glyphosate + Sencor | 9 | 7 | 7 | 9 | 9 | 9 |
| Gramoxone | 8 | N | 8 | 8 | 7 | 7 |
| Gramoxone + 2,4-D or Clarity² | 9 | N | 9 | 8 | 8+ | 7 |
| Gramoxone + Atrazine | 8+ | 7 | 8 | 9 | 9 | 9 |
| Gramoxone + Metribuzin |
8+ |
N |
8 |
8+ |
9 |
7 |
| Gramoxone + Sencor | 8+ | N | 8 | 8+ | 9 | 7 |
| Harmony Extra | 9 | N | 7 | N | 9 | N |
| Hornet (spring applied) | N | N | 8 | N | 7 | N |
| Ignite | 8 | N | N | 6 | 8 | N |
| Liberty |
8 |
N |
N |
6 | 8 |
N |
| Lumax | 8 | N | 7 | N | 9 | N |
| Sharpen | 8 | N | N | N | 8 | N |
| Sharpen + glyphosate | 9 | 7 | 7 | 9+ | 9 | 9 |
| Valor SX | 8 | N | N | N | 7 | N |
|
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