Agronomy

Fall Burndown Options For Corn And Soybeans

November 1, 2022

Fall is an excellent time to control many troublesome perennial and/or winter annual weeds, such as:

dandelion
chickweed
henbit
purple deadnettle
pennycress
shepherd’s purse
marestail
Canada thistle
white cockle
prickly lettuce
poison hemlock
pokeweed
various mustard species

Fall herbicide programs have a wide application window and may be applied from harvest until the ground freezes. Once the ground freezes, weed growth will essentially have ceased. Applications after this limit herbicide effectiveness and increase the risk of residual herbicide runoff onto sensitive areas. Optimum residual activity with residual herbicides is obtained when fall applications are delayed until soil temperatures are 50ºF or cooler.

Fall Burndown Herbicide Options – Corn Following Year
Herbicide Mix	Comments
Simazine 4L or 90DF (1.0 qt/a or 1.1 lb/a) + glyphosate³ (0.56-1.5 lb ae/a) + (2,4-D)+ Class Act^® NG¹ (1.25 – 2.5 gal/100 g)	Plant corn next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses.
Dimetric™ EXT (1/3-2/3 lb/a) + (2,4-D)+ Superb HC or Destiny HC (2 qt/100 g)	Plant corn next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Weeds <2” tall. Use higher rate range of 2,4-D for dandelions.
Dimetric™ EXT (1/3-2/3 lb/a) + (2,4-D)+ glyphosate³ (0.56-1.5 lb ae/a) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant corn next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses.

Fall Burndown Herbicide Options – Corn or Soybeans
Herbicide Mix	Comments
Authority^® MTZ (8-20 oz/a) + Superb^® HC or Destiny^® HC (2 qt/100g)	Plant corn or soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds and grasses. Provides good residue activity next spring. Corn may be planted 4 months after Authority^® MTZ applications rates of 14 oz/a or less. Refer to label about soil pH restrictions.
Authority^® MTZ (8-20 oz/a) + (2,4-D) + Superb^® HC or Destiny^® HC (2 qt/100g)	Plant corn or soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Use higher rate range of 2,4-D for dandelions. Provides good residue activity next spring. Corn may be planted 4 months after Authority^® MTZ applications rates of 14 oz/a or less. Refer to label about soil pH restrictions.
Authority^® MTZ (8-20 oz/a) + glyphosate³ (0.56-1.5 lb ae/a) + Superb^® HC or Destiny^® HC (2 qt/100g) or Class Act NG (1.25-2.5 gal/100)	Plant corn or soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds and grasses. Provides good residue activity next spring. Corn may be planted 4 months after Authority^® MTZ applications rates of 14 oz/a or less. Refer to label about soil pH restrictions.
glyphosate³ (0.56-1.5 lb ae/a) + Class Act NG (2.5 g/100 g)	Plant corn or soybeans next year. Apply in the fall after harvest on until weeds become dormant. Broad spectrum control of winter annual weeds and grasses. No residual activity.
glyphosate³ (0.56-1.5 lb ae/a) + (2,4-D)+ Class Act NG¹ (2.5 g/100 g)	Plant corn or soybeans next year. Apply in the fall after harvest on until weeds become dormant. Broad spectrum control of most winter annual weeds and grasses. Use higher rate range of 2,4-D for dandelions. No residual activity.
Python WDG (0.8-1.0 oz/a) + Dimetric™ EXT (1/3-2/3 lb/a) + (2,4-D) + Superb HC (2 qt/100 g) +AMS¹ (2-4 lb/a)	Plant corn or soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Use higher rate range of 2,4-D for dandelions. Weeds < 4” tall. Good residue activity next spring.
(2,4-D) + Superb HC (2 qt/100 g) or Preference^® (2 pt/100 g)	Plant corn or soybeans next year. Apply in the fall after harvest on until weeds become dormant. Broad spectrum control of many winter annual weeds. Use higher rate range of 2,4-D for dandelions. No residual activity.
Valor^®SX (1.0-3.0 oz/a) + glyphosate³ (0.56-1.5 lb ae/a) + (2,4-D) + Class Act^® NG^®1 (5-10 qt/100g) or Superb^® HC or Destiny^® HC (2 qt/100g) + AMS (2-4 lb/a)	Plant corn or soybeans next year. Apply in the fall after harvest and before the ground freezes. If corn is planned for next spring use 1.0-2.0 oz/a of Valor^® SX. Broad spectrum control of most winter annual weeds and grasses. Weeds <4” tall.

Fall Burndown Herbicide Options – Soybeans following year
Herbicide Mix	Comments
Authority^® Assist (4-6 fl oz/a) + glyphosate³ (0.5 lb ae/a) + (2,4-D)⁺ Class Act^® NG^®1 (5-10 qt/100g) or Superb^® HC or Destiny^® HC (2 qt/100g) + AMS (2-4 lb/a)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Authority^® Assist provides good residue activity next spring.
Authority^® First (3-8 oz/a) + glyphosate³ (0.5 lb ae/a) + (2,4-D) + Class Act^® NG^®1 (5-10 qt/100g) or Superb^® HC or Destiny^® HC (2 qt/100g) + AMS (2-4 lb/a)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Authority First provides good residue activity next spring.
Canopy EX (1.1-3.3 oz/a) + (2,4-D) + Dimetric™ EXT (1/3-2/3 lb/a) + Superb HC or Destiny HC (2 qt/100 g) + AMS¹ (2-4 lb/a) or 28%¹ (2-4 qt/a)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Weeds <3” tall Use higher rate range of 2,4-D for dandelions. Good residual activity next spring.
Canopy EX (1.1-3.3 oz/a) + (2,4-D) + glyphosate³ (0.56-1.5 lb ae/a) + Superb HC/Destiny HC (2 qt/100 g) + AMS¹ (2-4 lb/a) or 28%¹ (2-4 qt/a)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Good residual activity next spring.
Dimetric™ EXT (1/3-2/3 lb/a) + (2,4-D) + Superb HC (2 qt/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Weeds <2” tall. Use higher rate range of 2,4-D for dandelions. Some residual activity next spring.
Dimetric™ EXT (1/3-2/3 lb/a) + (2,4-D) + glyphosate³ (0.56-1.5 lb ae/a) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Some residual activity next spring.
Envive™ Herbicide (2.5-5.3 oz/a) + (2,4-D)+ Superb^® HC / Destiny^® HC (2 qt/100g) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Good residual activity next spring. Refer to the label for soil pH restrictions.
Envive™ Herbicide (2.5-5.3 oz/a) + (2,4-D) + Express^® Herbicide with Totalsol™ (0.15-0.33 oz/a) Superb^® HC / Destiny^® HC (2 qt/100g) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Express^® for added chickweed control. Good residual activity next spring. Refer to the label for soil pH restrictions.
Envive™ Herbicide (2.5-5.3 oz/a) + (2,4-D) + Express^® Herbicide with Totalsol™ (0.15-0.33 oz/a) + glyphosate³ (0.56-1.5 lb ae/a) + Superb^® HC / Destiny^® HC (2 qt/100g) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Express^® for added chickweed control. Good residual activity next spring. Refer to the label for soil pH restrictions.
Envive™ Herbicide (2.5-5.3 oz/a) + (2,4-D) + Sencor^® DF or Dimetric^™ DF (2-4 oz/a) + Superb^® HC / Destiny^® HC (2 qt/100g) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Good residual activity next spring. Refer to the label for soil pH restrictions.
Python WDG (0.8-1.0 oz/a) + Dimetric™ EXT (1/3-2/3 lb/a) + (2,4-D) + Superb^® HC or Destiny^® HC (2 qt/100g) + Class Act^® NG^®1 (1.25-2.5 gal/100g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Use higher rate range of 2,4-D for dandelions. Weeds < 4” tall. Good residue activity next spring.
Valor^® SX (2.0 – 3.0 oz/a) + glyphosate³ (0.56-1.5 lb ae/a) + (2,4-D) + Class Act NG¹ (1.25 – 2.5 gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of most winter annual weeds and grasses. Weeds <4” tall. Use higher rate range of 2,4-D for dandelions. Some residual activity next spring. Probably one of the best White Cockle treatments!
Valor SX (2.0-3.0 oz/a) + Canopy EX (1.1 oz/a) + (2,4-D) + Superb^® HC or Destiny^® HC (2 qt/100g) or Class Act NG¹ (1.25 – 2.5gal/100 g)	Plant soybeans next year. Apply in the fall after harvest and before the ground freezes. Broad spectrum control of many winter annual weeds. Weeds <4” tall. Use higher rate range of 2,4-D for dandelions. Some residual activity next spring.