Dithiopyr

Dithiopyr is the active ingredient found in the popular herbicide Dimension, among others.  As a preemergent herbicide, dithiopyr is only effective if applied before the target weeds emerge. One of the common uses of dithiopyr is to prevent crabgrass from popping up lawns in the spring.

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Dimension 2EW Herbicide Quick View
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A professional specialty selective pre-emergent herbicide that controls grass and broad-leaf weeds for commercial and residential cool & warm-season grasses.
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Hi-Yield Weed and Grass Stopper with Dimension Herbicide Quick View
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A pre-emergent and post-emergent herbicide for crabgrass and broad-leaf weeds in cool and warm-season grass and landscaping.
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Howard Johnsons Dimension 0.27G Herbicide Quick View
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A granular pre-emergent herbicide for control of grassy and broadleaf weeds.
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Ferti-Lome Winterizer and Weed Preventer II 10 - 0 -14 Quick View
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A selective pre-emergent herbicide plus fertilizer weed & feed for cool and warm-season home lawns.
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Ferti-Lome Crabgrass Preventer Plus Lawn Food with Dimension 20-0-3 Quick View
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A selective pre-emergent herbicide and lawn fertilizer that controls Crabgrass and other broad-leaf weeds and fertilizer for cool & warm-season grass.
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The Anderson's 21-0-10 Fertilizer with 0.25% Dimension Turf Herbicide Quick View
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Provides pre-emergence and early post-emergence control of crabgrass and broadleaf weeds and annual grasses on established lawns and ornamental turfs in cool season and warm-season grasses while feeding essential nutrients for healthier turf.
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Dimension Ultra 40WP Herbicide Quick View
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A professional selective pre-emergent and post-emergent herbicide that controls crabgrass and annual grasses plus broad-leaf weeds in cool & warm-season grass.
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Quali-Pro Dithiopyr 2EW Pre-Emergent Herbicide Quick View
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A high-performing Group 3 herbicide that provides early post-emergent crabgrass control
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A professional dual-active pre-emergent herbicide that controls and eliminates more than 120 types of broadleaf weeds and grass in turfgrasses, landscape ornamentals, and non-crop areas.
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Ferti-lome Weed Out Pro Turf 25-0-4 Lawn Fertilizer Quick View
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A selective pre-emergent herbicide plus fertilizer Weed & Feed for Crabgrass and broad-leaf weeds on cool & warm-season grasses.
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Fortress Ornamental Herbicide Quick View
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Granular pre-emergent herbicide with low odor formula that delivers weed control and optimum plant tolerance on ornamentals.
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Bonide DuraTurf Crabgrass and Weed Preventer for Lawns and Ornamental Beds Quick View
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Effectively controls crabgrass and other tough weeds on both Northern and Southern grasses.

What is Dithiopyr?
Dithiopyr is the active ingredient found in the popular pre-emergent heribicide Dimension.  This pre-emergent is effective at preventing the target weed seeds from germinating, and needs to be applied to weeds before they emerge from the ground. Dithiopyr is a popular active ingredient in weed prevention products and is often used to prevent crabgrass from growing in home lawns and yards in the spring.

How does Dithiopyr work?  (Mode of Action)
Dithiopyr controls weeds by disrupting microtubules which are neccessary for plant growth, so essentially the target weeds are not able lto grow.  It is important to make the distinction that pre-emerent herbicides do not destroy weeds entirely but rather prevent growth.  That is why they must be applied annually to retain the desired effects.

About Dimension
Dimension Herbicide is a specialty preemergent herbicide containing dithiopyr. When applied early it effectively prevents the growth of  control of crabgrass, crabgrass, goosegrass, chickweed, spurge and Poa annua.  Dimension is appropriate for both residential and commercial lawns. Dimension is also proven effective for use on golf courses, sports turf, landscape ornamentals, container- and field-grown nursery ornamentals, commercial sod farms, and noncrop areas including roadsides.

Toxicity
Dithiopyr is toxic to fish but non-toxic to birds. Products containing dithiopyr typically will carry instructions to keep the chemical away from water supplies and areas of runoff so as not to contaminate  water.

Popular Products Containing Dithiopyr
Hi-Yield Weed and Grass Stopper with Dimension Herbicide
Dimension 2EW Herbicide

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