knapweed

(redirected from Knapweeds)
Also found in: Dictionary, Thesaurus, Encyclopedia.

knapweed

Russian knapweed (Acroptilon repens). See centaurea.
References in periodicals archive ?
In Arkansas, spotted knapweed begins to flower in May and can continue flowering into October (personal observation), which is a longer period than for knapweed growing in the northwestern United States.
Releases ranged from 300 to 1,500 weevils per site, depending on the size of the knapweed infestation and the number of weevils collected the yr of release.
In 2012, only 2 sites were surveyed because of a drastic reduction of the number of spotted knapweed plants at the third site.
minutus emerged from spotted knapweed capitula at ambient temperatures.
Sex ratios were 50:50 before spotted knapweed flowering and after flowering during all 3 yr of the study.
Sobhian's successor, Rene Sforza, is renewing a spotted knapweed project in which he'll conduct explorations for biocontrols in Ukraine and Russia--areas formerly restricted during the Cold War.
minutus were made from diffuse knapweed infestations in Colorado Springs, CO, for the Arkansas releases.
quadrifasciata as an established natural enemy of spotted knapweed in northern Arkansas.
Larinus minutus, a biological control agent of spotted knapweed, has been established at 2 sites in Washington County, Arkansas.
Seasonal Dynamics and Impact of Urophora quadrifasciata (Meigen) (Tephritidae: Diptera) on Spotted Knapweed in the Arkansas Ozarks.
Establishment of Larinus minutus Gyllenhal (Coleoptera: Curculionidae) for biological control of diffuse and spotted knapweed in the western United States.