Management of Turfgrass Pests; Weeds, Diseases, and Insects, Bulletin L-187, Introduction

Ohio State University Extension Bulletin

Management of Turfgrass Pests Weeds, Diseases, and Insects 2004

Bulletin L-187

Management of Turfgrass Weeds

Broadleaf Weed Table:

Post emergent chemical control recommendations for selective control of broadleaf weeds in established turfgrass

Weed Life Cycle¹ Recommended Chemical² Time of Application

Bindweed P 2,4-D ester, 2,4-D⁶, trimec⁸, or dicamba⁴ early summer

Black medic A 2,4-D⁶, MCPP, trimec⁸,clopyralid⁷, or dicamba⁴ midspring

Chickweed, common A MCPP, 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴ late fall or early spring

Chickweed, mouse-ear P MCPP, 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴ fall or spring

Chickory P 2,4-D⁶, trimec⁸, or dicamba⁴ spring

Cinquefoil P 2,4-D⁶, MCPP, or dicamba⁴ fall or spring

Dandelion P 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴ fall or spring

Dock, curly P 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴ fall or spring

Garlic or onion P 2,4-D ester, trimec^8, or dicamba⁴ late fall, early spring

Ground ivy P 2,4-D⁶, MCPP, trimec⁸, or dicamba⁴ late spring, summer, fall

Heal-all P 2,4-D⁶, trimec⁸, or dicamba⁴ spring

Henbit A 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴ early spring

Knotweed A 2,4-D⁶, trimec⁸, or dicamba⁴ late spring to midsummer

Mallow, roundleaf A or B 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴ summer

Pigweed A 2,4-D⁶, trimec⁸, or MCPP summer

Plantain, buckhorn P 2,4-D⁶, MCPP, trimec⁸, or clopyralid⁷ fall or spring

Plantain, common P 2,4-D⁶, MCPP, trimec⁸, or clopyralid⁷ fall or spring

Poison ivy P 2,4-D ester³, trimec⁸, clopyralid⁷, or Roundup⁵ spring or summer

Purslane A trimec⁸ or dicamba⁴ spring or summer

Red sorrel P dicamba⁴ spring, summer or fall

Speedwell, creeping P 2,4-D⁶, MCPP, or trimec⁸ spring or fall

Speedwell, annual A 2,4-D⁶, MCPP, or trimec⁸ early spring, late spring

Spurge, spotted A 2,4-D⁶, MCPP, dicamba⁴, trimec⁸, or 2,4-DP early spring or summer

Sow thistle A 2,4-D⁶ or dicamba⁴ fall

Thistle, Canada P 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba^3,4 spring or fall

Wild violet P triclopyr+clopyralid⁷, or dicamba^3,4 spring or fall

White clover P 2,4-D⁶, MCPP ⁶, trimec⁸, clopyralid^3,7, or dicamba⁴ spring, summer or fall

Wild carrot B 2,4-D⁶, trimec⁸, or dicamba⁴ fall or spring

Yarrow P dicamba⁴ late spring to midsummer

Yellow wood sorrel (Oxalis) P 2,4-D⁶, trimec⁸, clopyralid^3,7 2,4-DP summer

¹ A = Annual, B = Biennial, P = Perennial.
² Do not use 2,4-D on golf course greens and use with caution on other bentgrass turf.
³ Three or more applications may be necessary to eradicate hard-to-control weeds.
⁴ Dicamba, or dicamba-containing products may accumulate in the soil with frequent or extensive use which may result in damage to trees, shrubs, or other ornamentals.
⁵ Nonselective herbicides. Spot treat only.
⁶ Combinations of 2,4-D, MCPP, 2,4 DP, and dicamba are effective combinations for many broadleaf weeds. See next chart. Follow label directions carefully.
⁷ Clopyralid is usually combined with triclopyr in the product Confront^®. Do not apply to exposed shallow rooted trees or suckers. Do not use on golf course greens or tees. Can not be used on residential turfgrass.
⁸ Trimec is a component of several premixes (e.g. Super Trimec, Trimec Turf Ester, Trimec Classic, etc). Use formulation labeled for each problem weed.

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Weed	Life Cycle¹	Recommended Chemical²	Time of Application
Bindweed	P	2,4-D ester, 2,4-D⁶, trimec⁸, or dicamba⁴	early summer
Black medic	A	2,4-D⁶, MCPP, trimec⁸,clopyralid⁷, or dicamba⁴	midspring
Chickweed, common	A	MCPP, 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴	late fall or early spring
Chickweed, mouse-ear	P	MCPP, 2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴	fall or spring
Chickory	P	2,4-D⁶, trimec⁸, or dicamba⁴	spring
Cinquefoil	P	2,4-D⁶, MCPP, or dicamba⁴	fall or spring
Dandelion	P	2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴	fall or spring
Dock, curly	P	2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴	fall or spring
Garlic or onion	P	2,4-D ester, trimec^8, or dicamba⁴	late fall, early spring
Ground ivy	P	2,4-D⁶, MCPP, trimec⁸, or dicamba⁴	late spring, summer, fall
Heal-all	P	2,4-D⁶, trimec⁸, or dicamba⁴	spring
Henbit	A	2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴	early spring
Knotweed	A	2,4-D⁶, trimec⁸, or dicamba⁴	late spring to midsummer
Mallow, roundleaf	A or B	2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba⁴	summer
Pigweed	A	2,4-D⁶, trimec⁸, or MCPP	summer
Plantain, buckhorn	P	2,4-D⁶, MCPP, trimec⁸, or clopyralid⁷	fall or spring
Plantain, common	P	2,4-D⁶, MCPP, trimec⁸, or clopyralid⁷	fall or spring
Poison ivy	P	2,4-D ester³, trimec⁸, clopyralid⁷, or Roundup⁵	spring or summer
Purslane	A	trimec⁸ or dicamba⁴	spring or summer
Red sorrel	P	dicamba⁴	spring, summer or fall
Speedwell, creeping	P	2,4-D⁶, MCPP, or trimec⁸	spring or fall
Speedwell, annual	A	2,4-D⁶, MCPP, or trimec⁸	early spring, late spring
Spurge, spotted	A	2,4-D⁶, MCPP, dicamba⁴, trimec⁸, or 2,4-DP	early spring or summer
Sow thistle	A	2,4-D⁶ or dicamba⁴	fall
Thistle, Canada	P	2,4-D⁶, trimec⁸, clopyralid⁷, or dicamba^3,4	spring or fall
Wild violet	P	triclopyr+clopyralid⁷, or dicamba^3,4	spring or fall
White clover	P	2,4-D⁶, MCPP ⁶, trimec⁸, clopyralid^3,7, or dicamba⁴	spring, summer or fall
Wild carrot	B	2,4-D⁶, trimec⁸, or dicamba⁴	fall or spring
Yarrow	P	dicamba⁴	late spring to midsummer
Yellow wood sorrel (Oxalis)	P	2,4-D⁶, trimec⁸, clopyralid^3,7 2,4-DP	summer
¹ A = Annual, B = Biennial, P = Perennial. ² Do not use 2,4-D on golf course greens and use with caution on other bentgrass turf. ³ Three or more applications may be necessary to eradicate hard-to-control weeds. ⁴ Dicamba, or dicamba-containing products may accumulate in the soil with frequent or extensive use which may result in damage to trees, shrubs, or other ornamentals. ⁵ Nonselective herbicides. Spot treat only. ⁶ Combinations of 2,4-D, MCPP, 2,4 DP, and dicamba are effective combinations for many broadleaf weeds. See next chart. Follow label directions carefully. ⁷ Clopyralid is usually combined with triclopyr in the product Confront^®. Do not apply to exposed shallow rooted trees or suckers. Do not use on golf course greens or tees. Can not be used on residential turfgrass. ⁸ Trimec is a component of several premixes (e.g. Super Trimec, Trimec Turf Ester, Trimec Classic, etc). Use formulation labeled for each problem weed.