General Information


This product is not recommended for use by homeowners.

Note: In the state of New York, this product may be applied only by commercial applicators.

For control of crabgrass and other annual grasses and broadleaf weeds,

use Quali-Pro Dithiopyr 40 WSB specialty herbicide in the following sites:

- established lawns

- commercial sod farms

- non cropland and industrial sites

- ornamental turf (including golf course fairways, roughs, tee boxes)

- landscape ornamentals, field grown and container nursery ornamentals. Quali-Pro Dithiopyr 40 WSB only controls crabgrass up to initiation of tillering, that is, when seedlings are first visible in established turfgrasses. Quali- Pro Dithiopyr 40 WSB will not control emerged weeds. For optimum effectiveness, apply Quali-Pro Dithiopyr 40 WSB prior to initiation of tillering, and make all other applications before germination of target weeds.

Quali-Pro Dithiopyr 40 WSB must be activated to be effective. Activation is achieved by watering-in from rainfall or irrigation (1/2 inch or more). Time applications to ensure that activation occurs before the tillering stage of crabgrass development or prior to germination of all other weeds.

Limitations, Restrictions, and Exceptions

Ornamental Plantings – Field and Container Grown

10,890 - Sq ft per 1 water soluble pouch

Timing of Application - Make sequential applications 3 to 4 months apart to extend preemergence weed control.

Maximum Use Rate - Do not apply more than 1.5 lb ai/a per year using split or sequential applications (equivalent to 12 water soluble pouches per A or 1.375 oz/1,000 sq ft per year).

Use Precautions:

Do not apply when weather conditions favor drift to non-target areas. This product may injure foliage of non-target plants.

Do not graze livestock or feed forage cut from areas treated with this product. To avoid injury to ornamentals within noncrop areas, apply only after transplanting when soil around roots has been thoroughly settled by rainfall or irrigation.

Use Directions for Noncropland and Industrial Site

Quali-Pro Dithiopyr 40 WSB controls listed annual grasses and broadleaf weeds in terrestrial noncrop areas including but not limited to farm yards, fence rows, highway or roadside utility and railroad rights-of-way, airports, recreation areas, campgrounds, and industrial sites such as lumber yards, tank farms, and storage areas.

Quali-Pro Dithiopyr 40 WSB is a preemergence herbicide and controls weeds as they germinate; it will not control established weeds. For optimum weed control, apply Quali-Pro Dithiopyr 40 WSB before weeds germinate or direct sprays to soil that is free of clods, weeds and debris such as leaves. Prior to making an application, control existing vegetation by cultivation, hand weeding, or use of postemergence herbicide.

Quali-Pro Dithiopyr 40 WSB contains the active ingredient dithiopyr which is only effective in weed control after the product is activated. Activation requires 1/2 inch or more of rainfall or irrigation applied to the weeds or soil before germination of target weeds. After activation of the treatment, do not disturb (i.e., mix) the soil surface to expose untreated soil.

This product is not recommended for use by homeowners.

Note: In the state of New York, this product may be applied only by commercial applicators.

Restricted Entry Interval

12 hours