Poa annua (weed)

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infestation of glyphosate-resistant Poa annua in a dormant bermudagrass (Cynodon spp.) golf course (click on image to enlarge it)
Author(s): James T. Brosnan, Matthew T. Elmore and Muthukumar V. Bagavathiannan
Source: Weed Technology (2020), 34, p. 425

Poa annua (weed) L. - (annual bluegrass)

This weed is widespread in temperate regions and a low-growing grass. It is usually less desirable compared to other grasses because it has little tolerance to heat or cold and often dies unexpectedly due to various stress factors or diseases. It is not eaten by grazing animals because of its small height. As a weed, it is mainly a problem in other types of turfgrasses (like creeping bentgrass) and in cereals. It germinates in late summer and develops seed heads during late winter and spring. The seeds disperse through animals, man or water.

Vernacular names
• Deutsch: Einjährige Rispe
• English: annual bluegrass
annual meadow grass
• Español: poa anual
pastito de invierno
• Français: pâturin annuel

P. annua is difficult to control and has often developed resistance to herbicides (Brosnan et al., 2020). Since it has a shallow root system, growth can be reduced by watering infrequently. The plant typically reaches a height of only 10-15 cm, occasionally up to 30 cm. It has an open panicle, 6-7 cm long, and a pointed ligule. The tips of the leaves have a characteristic boat-like shape.

For details see the respective page in Wikipedia.