Index Catalog // ScholarsArchive@OSU

Start Over

Filtering by: Subject Biological pest control agents Degree Field Entomology Subject Tansy ragwort -- Biological control

Assessing the safety of weed biological control : a case study of the cinnabar moth Tyria jacobaeae

Creator:

Fuller, Jason L.

Abstract:

The cinnabar moth, Tyria jacobaeae (L.) (Lepidoptera:Arctiidae), was released in 1959 to control the grassland weed tansy ragwort, Senecio jacobaea L. (Asteraceae), despite evidence that caterpillars of this species can feed on native plants within the genera Senecio and Packera. Previous studies confirmed the moth's ability to develop on the...

Resource Type:

Masters Thesis

Full Text:

estimate the risk posed to native plants in Oregon by a biological control agent. The moth was first
The effects of intraspecific plant competition and insect herbivory of ragwort (Senecio jacobaea) populations

Creator:

Fitzpatrick, Greg S.

Abstract:

I conducted field studies to determine the effect of insect herbivory and intraspecific plant competition on ragwort Senecio jacobaea. The objectives were to determine the patterns and causes in the distribution of the ragwort flea beetle Longitarsus jacobaeae foraging among varying densities of ragwort, to measure the behavioral and numerical...

Resource Type:

Masters Thesis

Full Text:

. Keywords: Host density effects, behavioral response, reproductive response, biological control agent