INVESTIGADORES
BENTIVEGNA Diego Javier
congresos y reuniones científicas
Título:
Why is it here and how do we get of it?
Autor/es:
SMEDA R.J.; BENTIVEGNA D. J.
Lugar:
Osage Beach
Reunión:
Conferencia; 37th Natural Areas Conference; 2010
Resumen:
Cut-leaved teasel (Dipsacus laciniatus L.) is one of two troublesome Dipsacus species found across the US, and mostly north of 37o latitude.  Originally introduced from France to New England states to assist the separation of wool fibers (hence the name “teasel”), plants have spread along transportation corridors to the West Coast.  Teasel exhibits primarily a biennial growth habit, and emergence in Missouri almost exclusively occurs in October and April.  Teasel grows along roadsides and in ditches as well as drier habitats; taproots have been measured up to 60 cm in length.  Once established, plants form almost exclusive monocultures, and can reach a height up to 2 meters.  In Missouri, plants flower from mid-July through August and can produce over 30,000 seeds.  Seeds are present in open locules; late season mowing and the attractiveness of seedheads in dried flower arrangements promotes infestations  into new areas.  Herbicides such as aminopyralid, combinations of traditional growth regulators (2,4-D, triclopyr, dicamba, picloram, clopyralid), and metsulfuron-methyl result in excellent postemergence activity, but the persistence of seed (~6% viability after 3 years) allows re-infestation of teasel.  Long-term management of teasel requires a concerted effort to repeatedly treat infested areas, minimize spread of seed, and promote the introduction of desirable, competitive species to preclude re-infestations.