Herbicide Recommendations for Turfgrass: Inhibitors of Smooth Crabgrass and Dandelion Seed Germination

Table of Contents

1. Nutrite Pre-Emergent, Crabgrass Weed Seed Germination Inhibitor
2. Turfmaize Pre-Emergent Weed Seed Germination Inhibitor
3. Related Links

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• The product may inhibit dandelion and smooth crabgrass weed seed germination when used in conjunction with a sound turf maintenance program.
• This program will not control emerged or established dandelion or smooth crabgrass.
• PRE - Apply to established turf twice a year; once in early spring and once in late summer or early fall to sports fields, parks, golf areas and sod farms.
• Apply using a rotary or small hand spreader.
• Spring application: two weeks before large crabgrass seed germination.
• Late summer or early fall: after heat stress has passed.
• Apply to a mature turf where established perennial ryegrass is the predominant species.
• Do NOT apply on newly seeded grass, wait until after first mowing.
• Do NOT apply under windy conditions.
• Do NOT apply in the spring if overseeding or resodding in the spring.
• Do NOT apply in the fall if overseeding or resodding in the fall.
• Do NOT apply if allergic to corn.

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• The product may inhibit dandelion and smooth crabgrass weed seed germination when used in conjunction with a sound turf maintenance program.
• This program will not control emerged or established dandelion or smooth crabgrass.
• PRE - Apply to Kentucky bluegrass turf twice a year: once in early spring and once in the late summer/early fall.
• Apply using a rotary or small hand spreader.
• Spring application: apply to established Kentucky bluegrass turf in early spring before smooth crabgrass and dandelion seed germination.
• Late summer/early fall: Apply to established Kentucky bluegrass turf in late summer or early fall after heat stress has passed.
• Apply when soil is moist and rain is forecasted within 2 days of treatment.
• If rainfall does not occur within 2 days of treatment, irrigation is required.
• Excessive moisture at time of treatment may reduce the effectiveness.
• Do NOT apply on newly seeded grass, wait until after first mowing.
• Do NOT apply in the spring if overseeding or resodding in the spring.
• Do NOT apply in the fall if overseeding or resodding in the fall.
• Do NOT apply if allergic to corn.

Related Links

• Weeds in Ontario
• Turfgrass in Ontario
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control