Table 3.7.4. Burndown for zone/no-tillage corn

Burndown for zone/no-tillage corn
Weed Situation	Amount of Product per Acre	Remarks and Limitations
Legume-grass sod control initiated in fall	44 fl. oz. Roundup Powermax or 48 fl. oz. Durango DMA or 48 fl.oz. Touchdown Total + 1 pt. of 3.8 lb./gal. 2,4-D	Group 4 and 9 herbicides: Apply these or other glyphosate products plus 2,4-D as a foliar spray in fall when grasses are at least 8 in. tall (4- to 5-leaf stage) and actively growing. A reduced rate of glyphosate or an application of *Gramoxone SL 2.0 may be needed to enhance burndown of germinating weeds before or at planting in the spring. If alfalfa, dandelions, or other perennial broadleaf weeds persist, apply ½ pt./A Banvel, Clarity, or DiFlexx postemergence before corn is 30 in. tall.
Legume-grass sod control at planting	44 fl. oz. Roundup Powermax or 48 fl. oz. Durango DMA or 48 fl.oz. Touchdown Total + 1 pt. of 3.8 lb./gal. 2,4-D	Group 4 and 9 herbicides: Apply these or other glyphosate tank mixes when grasses are at least 8 in. tall (4- to 5-leaf stage) at least 7 days before planting. May be tank mixed with residual herbicides registered for early preplant use. If alfalfa, dandelions, or other perennial broadleaf weeds persist, apply ½ pt./A Banvel, Clarity, or DiFlexx postemergence before corn is 30 in. tall.
Previously cropped with cover crop of rye, barley, wheat, or ryegrass	20 fl. oz. Roundup Powermax or 24 fl. oz. Durango DMA or 24 fl.oz. Touchdown Total or 3-4 pt. *Gramoxone SL 2.0	Group 9 or 22 herbicides: Apply from 7 days before planting up to and at the time of planting. When using *Gramoxone SL 2.0 for burndown, add a nonionic surfactant to the spray tank to enhance penetration and total kill.
Previously cropped with no cover crop	20 fl. oz. Roundup Powermax or 24 fl. oz. Durango DMA or 24 fl.oz. Touchdown Total or 3-4 pt. *Gramoxone SL 2.0	Group 9 or 22 herbicides: Apply from 7 days before planting up to and at the time of planting. When using *Gramoxone SL 2.0 for burndown, add a nonionic surfactant to the spray tank to enhance penetration and total kill. If weed cover is minimal, a burndown herbicide may not be needed depending on what other herbicides are being applied.
Previously cropped with no cover crop	22 fl. oz. Roundup Powermax or 24 fl. oz. Durango DMA or 24 fl.oz. Touchdown Total + 2-3 fl. oz. § Sharpen or 10-18 fl. oz. § Verdict	Group 9, 14, and 15 herbicides: Apply prior to crop emergence with adjuvants according to label. Either § Sharpen or § Verdict will enhance burndown of annual broadleaf weeds. § Sharpen will provide residual control of annual broadleaf weeds while § Verdict will provide residual control of annual grasses and broadleaf weeds. *§ Verdict rates vary depending on soil texture. A postemergence treatment may be required for full season weed control. If weed cover is minimal, a burndown herbicide may not be needed depending on what other herbicides are being applied.
Problem Weed Dandelion	0.38-0.5 oz. Express + 1 pt. of 3.8 lb./gal. 2,4-D LVE	Group 2 and 4 herbicides: Apply in fall to actively growing dandelions or in spring at least 14 days before planting corn. Add crop oil concentrate according to label. This combination has provided the most consistent dandelion control.
Problem Weed Dandelion	22 fl. oz. Roundup Powermax or 24 fl. oz. Durango DMA or 24 fl.oz. Touchdown Total + 1 pt. of 3.8 lb./gal. 2,4-D LVE	Group 4 and 9 herbicides: Apply in fall or in spring prior to planting corn. Addition of crop oil concentrate may enhance dandelion control.
*Restricted-use pesticide; may be purchased and used only by certified applicators or used by someone under the direct supervision of a certified applicator. Refer to Section 3.7.3 for information on herbicide resistance management and site of action groups.