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Concept
Aegilops cylindrica
Résumé
Aegilops cylindrica, also known as jointed goatgrass, is an annual grass seed that is part of the tribe Triticeae, along with wheat and some other cereals. It is not native to North America, however it has become a serious issue as a weed since it was introduced in the late 19th century. Due to its relation to winter wheat, it is very difficult to control. Not only are the grains similar in shape and size to the seeds of winter wheat, making it difficult to remove through grain cleaning methods, the shared genetics mean that no registered herbicides are available to single out jointed goatgrass while leaving winter wheat unharmed. This poses problems for farmers who have to suffer through reduced yields and poorer quality winter wheat.
Jointed goatgrass is a winter annual grass seed native to Southern Europe and Russia, It is considered a problem weed in United States, where it is now widely spread across western and central regions. It entered the US at several different times and at different locations, however the first was possibly in the late 19th century when Mennonite settlers from Russia brought Turkey winter wheat to Kansas. The first sample of jointed goatgrass was collected in Centerville, DE in 1870 and later samples collected in 1910 showed that jointed goatgrass had escaped from experimental plots on South Dakota State University campus at Brookings, SD.
In 1999, it was reported that jointed goatgrass had infested an estimated in the US alone, and that this was annually increasing at a rate of about . In 1986, jointed goatgrass had been reported as having infected less than 1% of winter wheat fields in seven counties in Nebraska, yet it was rated one of the ten most troublesome weeds, concerning 13% of respondents to a 1984 farmer survey.
Human activities, wind, and machinery help to spread jointed goatgrass seeds once the joints disarticulate. However, due to the size of joints, wind dispersal is not as effective at spreading jointed goatgrass.
Source officielle
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