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G & S Landscape Tips #2 - Weed Control Planner

It's about that time to start thinking about controlling those weeds before they get out of control! Here is a weed Watch List for the whole of the USA - how to identify your toughest weeds, the areas they grow in, and when to get rid of them!

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Crabgrass 

 (photo via - aragriculture.org)

The weed with the greatest stranglehold nationwide is crabgrass. The summer annual is light green in color and can be identified by its leaf blades, which can be longer than two inches, hairy and rolled in the bud.

 

Crabgrass tends to be hard to control so you need to get it when it's mature or when it's in its adolescence period, when it is producing seeds.

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Dallisgrass

 (photo via - american-lawns.com)

Dallisgrass is a warm-season perennial, coarse textured grassy weed that is light in color. The leaves are rolled in the bud, flat and wide. The weed mainly grows east to west from Virginia to California and the states south.

The key to controlling dallisgrass is to prevent it from getting into the lawn in the first place . Producing a dense, healthy stand of turfgrass is one of the best methods for controlling dallisgrass, but talk to your local weed control professional for help with contolling it when it does infest.

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Dollarweed

 (photo via - scsphotogallery.tamu.edu)

Dollarweed, which thrives in wet conditions, is a large problem in Florida and can be found in all Gulf coast states. Also known as pennywort, its leaves are round in shape, about 1 inch in diameter and have scalloped edges. The leaves tend to be dark green and glossy.

Spring is the best time of year to treat the weed.

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Doveweed

 (photo via - auburnturf.blogspot.com)

Doveweed is found in southern states, such as Virginia, into Georgia and west to Texas. However Florida is most affected by the weed. Doveweed germinates later in the growing season and can be identified by short leaf sheaths with short hairs on the upper margins.

Doveweed is very difficult to control and can regrow after treatments. Why is doveweed so hard to control in lawns? " It is a hard, woody weed. You need repeat applications, and even then you're not getting good enough control. The chemistry doesn't exist right now where you're able to control doveweed very well." says Patrick Bell, product manager,North America U.S. Turf and Ornamental Business, Dow Agro Sciences.

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English Daisy

 (photo via - examiner.com) 

For states in the Northeast region and along the Pacific Coast, English daisy causes problems because of its spreading habit. The leaves on the weed form a basal tuft or rosette, while its flower is comparable to daisies with white petals and yellow centers. The plant can be 3 to 4 inches tall.

"It can be hairy, which helps repel herbicides," says PBI/Gordon's Obermann. "It is often very resistant to herbicides."

The best time of year to treat English daisy is when it's young and actively growing, meaning the spring.

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Ground Ivy

 (photo via - ppws.vt.edu)

Also know as creeping charlie, ground ivy is found in the Northeast, Mid-Antlantic, Mid-Continent and North Central regions of the country.

The weed tends to grow in shaded areas and has leaves that are round to kidney shape and are opposite on petiole attached to stems that root at the nodes.  It's creeping growth is what makes it hard to control.

Ground ivy is generally controlled postemergently and can be treated in fall and mid-spring.

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Poa Annua/ Blue Grass

 (photo via - aragriculture.org)

Also know as annual bluegrass, poa annua is a small clumped, yellow-green weed. The weed has boat-shaped tips and folds in at the bud. It can be found throughout the U.S. and tends to cause problems in the Southeast, Southwest and Northwest regions.

Poa annua can be treated pre-emergently to prevent infestation and limit spreading. It tends to germinate in late summer and early fall when soil temps drop into the mid-70's. "A second application can be applied in spring to control germinating plants," says UGA's McCullough.

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Nutsedge

 photo via - oregonstate.edu

There are two main types of nutsedge that cause problems throughout the U.S. Yellow nutsedge can be found across the country, while purple nutsedge is primarily found in warm, humid southern states.

Nutsedge has triangular stems with waxy grass-like leaves. Yellow nutsedge has yellow flowers, while purple has red-purple to brown flowers.

 

"The key to controlling nutsedge is to apply product in mid-to-late spring before it starts producing more tubers," says McAfee. It usually takes more than one application.

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Spurge 

 (photo via - aragriculture.org)

Spurge can be found throughout the U.S. and particularly, is a headache in the Southeast portion of the country. It's a summer annual and it's best to treat the weed pre-emergently.

"Spurge, if you miss it from a preemergent standpoint, if you miss it when it's very small..and even if you go after it froma postermergent standpoint, or a hand weeding standpoint, you really have to get the entire plant down to the root, " Bell says.

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Wild Violet

 (photo via - modishblog.com)

This cool season perennial broadleaf weed is found in mostly wet, shaded areas in the Mid-Continent and North Central regions. It can grow 2 - 5 inches tall and has leaves that vary but are generally heart shaped. Its flowers range in shades of white, blue and purple and appear in March to June.

"Wild violets are very difficult; they have a deep taproot and fibrous root system," says Obermann, with PBI/Gordon. "They get a thick waxy leaf on them that is almost like a repellent to herbicides."

Wild violets can be controlled by treating them in the spring when they begin to bloom and and before their leaves form that waxy texture, and then again in the fall.

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*This info is from the Lawn & Landscape magazine

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 Need help with your weed control in the Eastern Washington area? Call our office in the Spokane, Washington area. We'd be happy to give you a professional hand! 

G&S Landscape - (509) 276 - 2361 

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