Weed Watch
Annual Bluegrass. Photo: Steve Dewey, Utah State University,

Annual Bluegrass
Poa annua

Poa annua, also known as annual bluegrass, can be difficult to control if not properly managed. It tolerates low mowing and germination occurs in late summer and early fall, especially under cool, moist conditions. This weed grows erect and forms a tight clump, with light green, narrow leaf blades with boat-shaped tips. It is most commonly found in turf, landscapes and gardens and can sometimes be mistaken for Kentucky bluegrass. Once soil temperatures fall below 70 degrees, germination of Poa annua will begin.

Annual bluegrass produces most of its seedheads in spring, but early fall is the time that it germinates in most turf and landscape situations. Apply a preemergent herbicide, such as Dimension® specialty herbicide, this fall to get ahead of those seedlings and control early season crabgrass and other annual grassy and broadleaf weeds at the same time. To maximize your control and minimize callbacks, develop a dense, healthy turf to reduce sunlight at the soil surface. Keep soil phosphorus levels in the low to medium range. Last but not least, cultural practices can help reduce Poa annua, but herbicides are needed for superior control.

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A jumpstart on spring

One of the main reasons customers replace their lawn care operator is because of poor weed control. By using the right products at the right time, LCOs can keep commercial customers happy, while decreasing their heavy spring workloads.

A fall application of Kerb® SC T&O specialty herbicide by Corteva Agriscience™, Agriculture Division of DowDuPont, can help LCOs get a jumpstart on controlling Poa annua and other warm season grasses and broadleaf weeds in the spring.
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Photo: Dow AgroSciences
Photo: Dow AgroSciences

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Are you earning cash back with The Power of More™ Reward Club? Lawn care operators who simply purchase the Corteva Agriscience™, Agriculture Division of DowDuPont, products they need, when they need them, and submit receipts for rebates can earn cash back throughout the year. There is still time to complete and submit rebate forms by Oct. 30 to receive a rebate check this December. Head over to to learn more.
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Indiana LCO defends commercial lawns by combining preemergent herbicides

Keeping weeds out of sight is a constant battle. You don’t need to tell lawn care operator Pierre Bridger that. Director of operations for Vibrant Outdoors in Whitestown, Indiana, Bridger and his company cover both residential and commercial markets. Bridger found success in combining Gallery SC® plus Dimension® 2EW specialty herbicides for weed control in ornamental beds.
Learn more about his winning combination.


™® Trademarks of Dow AgroSciences, DuPont or Pioneer, and their affiliated companies or respective owners. State restrictions on the sale and use of Dimension, Dimension 2EW and Gallery SC apply. Consult the label before purchase or use for full details. Always read and follow label directions.
©2018 Dow AgroSciences LLC

This issue of Weed Watch was produced by North Coast Media's content marketing staff in collaboration with Dow AgroSciences. The series features key weeds, along with identification tips, control tips and product recommendations.

Photos: Power of More logo and Indiana LCO photo by Dow AgroSciences; Annual Bluegrass photo by Steve Dewey, Utah State University,