Knautia arvensis, commonly known as Field Scabious, is a species in the genus Knautia.
Species of scabious were used to treat Scabies, and many other afflictions of the skin including sores caused by the Bubonic Plague1. The word scabies comes from the Latin word for "scratch" (scabere). Another name for this plant is Gipsy Rose3. The genus Knautia is named after a 17th-century German botanist, Christian Knaut.
leaves
Young fruit
basal leaf - note that in this species it is lobed, whereas Devils Bit Scabious it is not
Foodplant / open feeder
larva of Abia sericea grazes on leaf of Knautia arvensis
In Great Britain and/or Ireland:
Foodplant / nest
female of Andrena hattorfiana provisions nest with pollen of Knautia arvensis
Foodplant / nest
female of Andrena marginata provisions nest with pollen of Knautia arvensis
Foodplant / spot causer
pycnidium of Ascochyta coelomycetous anamorph of Ascochyta scabiosae causes spots on live leaf of Knautia arvensis
Foodplant / miner
larva of Aulagromyza similis mines leaf of Knautia arvensis
Foodplant / parasite
embedded sorus of Bauhinus flosculorum parasitises live anther of Knautia arvensis
Foodplant / parasite
sorus of Bauhinus scabiosae parasitises live anther of Knautia arvensis
Remarks: season: 7-8
Foodplant / parasite
conidial anamorph of Erysiphe knautiae parasitises live Knautia arvensis
Foodplant / sap sucker
Macrosiphum rosae sucks sap of live Knautia arvensis
Foodplant / parasite
colony of sporangium of Peronospora violacea parasitises live petal of Knautia arvensis
Plant / resting place / within
puparium of Phytomyza nigritella may be found in leaf (midrib) of Knautia arvensis
Other: minor host/prey
Foodplant / spot causer
mostly hypophyllous colony of Ramularia anamorph of Ramularia tricherae causes spots on live leaf of Knautia arvensis
Foodplant / spot causer
central, 1-3 per spot, minute, black pycnidium of Septoria coelomycetous anamorph of Septoria scabiosicola causes spots on live leaf of Knautia arvensis
Remarks: season: 9-10