The flea beetle, Longitarsus jacobaeae (Swiss biotype), exhibited a classical biological control pattern on its host plant tansy ragwort (Senecio jacobaea L.) in Naramata, B.C. by rapidly increasing in number after its release and causing the decline of the plant. L. jacobaeae’s presence was identified by approximately 1.6-mm2 feeding holes in the ragwort’s leaves. L. jacobaeae fed preferentially on rosettes (p = 0.0333) as opposed to bolted plants (p = 0.4621). It caused a visibly significant decrease in the number of rosettes and bolted plants combined at the trial sites in 3–4 years (p = 0.0221). From the point of release, L. jacobaeae dispersed 100 m over the study site in 4 years.
Turner, Susan C., Ott, Peter K.; and Cesselli, Sandy C.. 2022. Longitarsus jacobaeae Swiss Biotype Effect on Tansy Ragwort (Senecio jacobaea) in Naramata, British Columbia. MoF. Technical Report (FLNRORD). tr140
Topic: FLNRORD Research Program
Scientific Name: Senecio jacobaea
English Name: Tansy Ragwort
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