Fall Weed Management, is it Right for You? - The P&PDL Picture of the Week - Plant & Pest Diagnostic Laboratory, Purdue University

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P&PDL Picture of the Week for
November 5, 2007

Fall Weed Management, is it Right for You?

Glenn Nice and Dr. Bill Johnson, Department of Botany & Plant Pathology, Purdue University

Table 1. Fall applied programs (taken from the article “Fall Applied Herbicides for Corn and Soybean 2006”) pdf file.

Herbicide/Mix¹	Rates / Acre²	Weeds	Comments

Autumn + 2,4-D COC + AMS	0.3 oz + 0.5 lb ai + 1% v/v + 1.5 lb	Common chickweed, henbit, dandelion, some mustards (pennycress, shepherd’s purse)	Broadleaves up to 3 inches tall, grasses less than 1 inch
Basis + 2,4-D + COC	0.5 oz + 0.5 lb ai1 + 1% v/v For dandelion control use 1 lb ae 2,4-D	Common chickweed, mustards (pennycress, shepherd’s purse, etc), marestail³, smallflower buttercup, deadnettle, and henbit, dandelion	Apply to weeds 3 inches or less. Plant corn the following year
Canopy EX + 2,4-D + COC	1.1 oz + 0.5 lb ai + 1% v/v	Common chickweed, cressleaf groundsel, mustards (pennycress, shepherd’s purse, etc), marestail³, smallflower buttercup, mouse-ear chickweed, Virginia pepperweed, yellow rocket, deadnettle, and henbit	Apply to weeds 3 inches or less. Plant soybean the following year.
Express + 2,4-D + COC	0.16-0.33 oz + 0.5 lb ai + 1% v/v	Common chickweed, mustards, marestail³, deadnettle and henbit, smallflower buttercup
Glyphosate	0.5-1.5 lb ai To slow the spread of glyphosate resistant marestail³, always apply with 2,4-D	Common chickweed, cover crops (winter wheat, Rye, fescue), Canada thistle, marestail³, dandelion, pokeweed, poison hemlock, musk thistle	Can be applied before corn or soybean
Glyphosate + 2,4-D	0.5-1.5 lb ae + 0.5- 1 lb ai	Alfalfa, common chickweed, cover crops (winter wheat, Rye, fescue), Canada thistle, marestail³, dandelion	Can be applied before corn or soybean
Valor + glyphostate + 2,4-D	2 oz + 0.75 lb ae + 0.5 lb ai	Common chickweed, mustard, marestail³, prickly lettuce, deadnettle and henbit, dandelion	Can be applied before corn or soybean
Harmony Extra XP + 2,4-D + NIS	0.4-0.5 oz + 0.5-1 lb ai + 0.25% v/v Use a fall followed by a spring application to control wild garlic.	Common chickweed, curly dock, henbit and deadnettle, mustards, smallflower buttercup	Can be applied before corn or soybean
Python + 2,4-D or glyphosate	0.8-1 oz + 0.5-1 lb ai or 0.5 lb ae Use 1 lb ai 2,4-D for control of dandelion	Mustards, prickly lettuce, marestail³	Can be applied before corn or soybean.
Sceptor 70DG + glyphosate + 2,4-D	2.8 oz + 0.5-1.5 lb ae + 0.5 lb ai	Alfalfa, common chickweed, cover crops (winter wheat, Rye, fescue), Canada thistle, marestail³, dandelion	Can be applied before soybean.
Sencor 4 + 2,4-D	1.25 pt + 0.5-1 lb ai	Mustards deadnettle and henbit, marestail³, prickly lettuce
¹ Not all products available in Indiana are listed in the table above. Reference to products in this article is not intended to be an endorsement to the exclusion of other that may have similar uses. ² COC = crop oil concentrate; ai = active ingredient; ae = acid equivalent (active ingredient and acid equivalent are often used when there are many products containing the same active component of a herbicide at different concentrations) ³ Also known as horseweed (Conyza canadensis).