| % Yield Reduction | ||||||
|---|---|---|---|---|---|---|
| WEEDS | 1 | 2 | 4 | 6 | 8 | 10 |
| (Number of weeds/100 ft of row) | ||||||
| C. Cocklebur or G. Ragweed | 4 | 8 | 16 | 28 | 34 | 40 |
| Redroot Pigweed or C. | 12 | 25 | 50 | 100 | 125 | 150 |
| Shattercane (2-3/clump) | 6 | 12 | 25 | 50 | 75 | 100 |
| Giant Foxtail (5-8/clump) | 10 | 20 | 50 | 100 | 150 | 200 |
Source: Univ. of Illinois Field Crop Scouting Manual
NOTE: All effects are additive. If more than one weed exists, add the effects of each yield reduction to get total yield reduction.
ligule, leaf blade and leaf sheath