poa annua life cycle
Root Type: Can die out in summer. Calibration The ligule is membranous and rounded. Annual bluegrass grows well in moist areas in full sun. The seeds ripen and are deposited 8 months of the year. Agronomic and Vegetable Crops The name Poa annua is universally accepted for this common and widespread weed. reptans.

The leaves are folded in the sheath which is smooth and somewhat compressed. Weed Links In Alfalfa apply before annual blue grass reaches 3 inches in height. Fibrous High Plains Integrated Pest Management Reproduction. Annual bluegrass seeds begin to germinate in late summer or fall as soil temperatures drop below 70°F.

General Chapters It is usually quite small, consisting of a low tuft of vegetation about 4" across and 1½" tall. Annual bluegrass leaf blade tips are prow-shaped, and leaves tend to be crinkled at the midsection. Protection of Pollinators Poa annua L. Poaceae (Grass family) Life cycle. Poae, infects and suppresses the growth of annual bluegrass without affecting desirable turfgrass species. However, substantially larger plants are sometimes observed. —

annua, and a perennial type, P. annua var. Mature plants grow in dense tufts, 3 to 12 inches tall with roots at the lower nodes. A further characteristic is that the leaves are often transversely wrinkled. It is primarily a weed of lawns and turfgrass. Leaves. For herbicide recommendations for specific grain rotations and weeds in Montana, please see the MSU Herbicide Chooser Tool. Annual bluegrass is a major weed in turf where it provides a weak sod that leads to poor footing in athletic fields and golf courses. Tutin TG, 1952. Seeds can remain dormant in the soil for several years before germinating. For a complete list of reports of herbicide resistance in annual bluegrass globally please see http://www.weedscience.org/Summary/USpeciesCountry.asp?lstWeedID=130&FmCommonName=Go.

Ligule: The leaves are flat, slightly keeled with characteristic 'tramlines'. Clump-forming winter or summer annual.

The inflorescence (flowering structure) is a terminal spreading panicle … Conditions that favor growth.

Annual bluegrass, in the family Poaceae, is a winter annual, clump-forming grass with a yellow-green color, prow-shaped leaf tips, and a distinctive whitish flower head. Preferring moist, shady areas, it emerges from fall through spring, flowers, and then dies with the onset of warm weather. The typical plant has sprawling culms about 2½" long that are unbranched, except at the base.

Seedlings mature in the fall and overwinter in a vegetative state. http://oregonstate.edu/weeds/.

It is in flower all year around except for severe winters. The annual type also tends to … There are reports of annual bluegrass resistance to a number of herbicide families including photosystem II inhibitors (Alabama, North Carolina, Oregon, Mississippi, and Virginia), ureas and amides (Oregon), thiocarbamates (Oregon), and dinitroanilines (North Carolina). Cool, moist conditions; compacted soil; close mowing; high levels of nitrogen. Recovery Plan for Three Granite Outcrop Plant Species. It can be found from the Arctic to the Antarctic regions in practically all terrestrial ecosystems. It tolerates the short mowing heights - forming seed heads that disrupt the uniformity and the ball roll of golf course greens. Apply to established seed alfalfa before alfalfa exceeds 12 inches in height. on herbicide usage. Growth Habit: IDENTIFICATION AND LIFE CYCLE. It infects Poa plants through wounds in the stem and leaf tissues and multiplies in the vascular system, causing wilting and death of the plants. Seed is produced in late spring and early summer. Stems. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Seed; enlarges by tillering. Annual blue grass going to seed.

The bacterium, Xanthomonas campestris pv. US Fish and Wildlife Service, 1993.

Life cycle:

Consult herbicide labels for additional rate, application, and safety information. Section 18 Exemptions Growth habit. It grows in a wide variety of soils, tolerates trampling, mowing, and frozen conditions, and is a frequent weed in areas heavily trafficked by livestock or humans.

Narrow, smooth Folded Additional herbicide information can be found at http://www.greenbook.net.

P. annua is a cosmopolitan grass that is listed as one of the most aggressive weeds invading areas from sea level up to 1200 m in elevation.

Insect Fact Sheets This species has the potential to outcompete other plants and crops. Disease Management Generally bunch type but can be stoloniferous Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. Livestock Individual plants can produce over 350 seeds. Read our Commitment to Diversity | Read our Privacy Statement.

Life cycle. Organic Pesticides Closeup of flower stalk. Preferring moist, shady areas, it emerges from fall through spring, flowers, and then dies with the onset of warm weather. Apply before bluegrass reaches 10 inches in height, before planting or emergence of the crop. — form a strategic partnership called N.C. Accessibility Collar:

Information and resources for the Ag Sciences community. It can be a difficult weed to control, as each plant produces several hundred seeds in a season that can lay dormant years before sprouting.

Annual bluegrass (Poa annua) is a low growing cool-season grass in the family Poaceae.

Life Cycle and Cultural Charateristics

IPM for Woody Ornamentals Annual bluegrass is a prolific seed producer but is well managed by most preemergence herbicides labeled for use.


W inter annual less than 1-ft. tall. P. annua is native to temperate areas of Eurasia. Cooperative Extension prohibits discrimination and harassment on the basis of race, color, national origin, age, sex (including pregnancy), disability, religion, sexual orientation, gender identity, and veteran status. The leaves are smooth and abruptly contracted at the apices to give a characteristic 'boat-shaped tip'. Privacy and Legal Statements

The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. long when flowering, and loosely arranged on delicate paired or spreading branches. Pest Sampling and Management Tactics Hairless, soft, light green leaves are folded in the bud and lack auricles. Vernation: This page was last modified 20:26, 28 March 2016 by. Biological Control of Arthropod Pests The ligule is membranous and rounded. Inhibition of acetolacetate synthase ALS (acetohydroxyacid synthase AHAS). Annual bluegrass, in the family Poaceae, is a winter annual, clump-forming grass with a yellow-green color, prow-shaped leaf tips, and a distinctive whitish flower head. It is primarily a weed of lawns and turfgrass. Integrated Pest Management Absent Field Records for Restricted Use NC State University and N.C. A&T State University work in tandem, along with federal, state and local governments, to School IPM, Compiled by Sandra Frost, University of Wyoming, Northwest Area Extension, Big Horn Basin Area Crop Systems Educator. Annual bluegrass is also weedy in alfalfa, grass seed, small grain, and potato. Annual bluegrass is a misnomer because there are two plant types of annual bluegrass—a true annual, P. annua var. It is listed as a weed in 38 crops in more than 80 countries within and outside its native distribution range. — Ligule. The spikelets are stalked, awnless, 1 to 2 cm (3/8 to 3/4 in.) IPM for Turfgrasses Annual bluegrass leaf blade tips are prow-shaped, and leaves tend to be crinkled at the midsection. Penn State Hotlines High Plains IPMHPIPM Origin of Poa annua L. Nature, 169:160. Screen reader support enabled. IPM Bugwood. Specific Chapters http://www.ipmimages.org/search/action.cfm?q=Poa%20annua, annual bluegrass, annual blue grass, walkgrass, Examples of herbicides that can be used to manage annual bluegrass, http://www.weedscience.org/Summary/USpeciesCountry.asp?lstWeedID=130&FmCommonName=Go, http://www.ipmimages.org/search/action.cfm?q=Poa%20annua, http://wiki.bugwood.org/index.php?title=HPIPM:Annual_bluegrass&oldid=55616, Center for Invasive Species and Ecosystem Health at the University of Georgia. Toggle navigation

Greenish white.

Auricles: For more information and images please visit

2020 The Pennsylvania State University. Identification and Life Cycle. N.C.


Seedhead Color: Poa is one of the most common weeds of highly maintained turfgrasses - sports fields and golf courses - giving golf course superintendents headaches when it invades their greens. Plants can flower at six weeks old and viable seed can be produced a few days after pollination, allowing plants to produce seed even when frequently mowed. While the two types aren’t easy to distinguish from each other, the annual type is more upright in its growth habit and produces more seed than the lower-growing perennial type.

Annual bluegrass (Poa annua) is a low growing cool-season grass in the family Poaceae.

A bacterium is being considered for registration as a bioherbicide. Winter annual

The list of countries in which this species now occurs may not be complete, as P. annua has spread to almost all areas of the world where temperate and subtropical crops are grown, and to some relatively undisturbed habitats.

They …

Large membranous Bunching. Poa annua Synonyms Annual Meadowgrass, Wintergrass ID Characteristics Life cycle: Winter annual Growth Habit: Generally bunch type but can be stoloniferous Propagation: Seed Ligule: Large membranous Auricles: Absent Vernation: Folded Collar: Narrow, smooth Root Type: Fibrous Poa annua . Avoid overwatering and applying too much nitrogen fertilizer.


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