A Study of the Natural Control of Ragwort (Senecio Jacobaea L.)

Cameron, E. Alan

doi:10.2307/2256123

Cited by 94 publications

(60 citation statements)

References 7 publications

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“…The plant is a facultative biennial and has a patchy distribution. It is a common weed in early successional communities and favours disturbed soil surfaces (Cameron 1935 The univoltine cinnabar moth (T. jacobaeae) is monophagous on ragwort in our study area. The adult emerges from a pupa between the end of April and June (Crawley 1989).…”

Section: Study Systemmentioning

confidence: 90%

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Do distances among host patches and host density affect the distribution of a specialist parasitoid?

2005

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The effect of spatial habitat structure and patchiness may differ among species within a multi-trophic system. Theoretical models predict that species at higher trophic levels are more negatively affected by fragmentation than are their hosts or preys. The absence or presence of the higher trophic level, in turn, can affect the population dynamics of lower levels and even the stability of the trophic system as a whole. The present study examines different effects of spatial habitat structure with two field experiments, using as model system the parasitoid Cotesia popularis which is a specialist larval parasitoid of the herbivore Tyria jacobaeae. One experiment examines the colonisation rate of the parasitoid and the percentage parasitism at distances occurring on a natural scale; the other experiment examines the dispersal rate and the percentage parasitism in relation to the density of the herbivore and its host plant. C. popularis was able to reach artificial host populations at distances up to the largest distance created (at least 80 m from the nearest source population). Also, the percentage parasitism did not differ among the distances. The density experiment showed that the total number of herbivores parasitised was higher in patches with a high density of hosts, regardless of the density of the host plant. The percentage parasitism, however, was not related to the density of the host. The density of the host plant did have a (marginally) significant effect on the percentage parasitism, probably indicating that the parasitoid uses the host plant of the herbivore as a cue to find the herbivore itself. In conclusion, the parasitoid was not affected by the spatial habitat structure on spatial scales that are typical of local patches.

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Section: Study Systemmentioning

confidence: 90%

“…The host then dies (Van der Meijden and Van der Veen-Van Wijk 1997). The parasitoid goes into a diapause in a woolly, white cocoon until the next year (Cameron 1935). C. popularis in turn is parasitised by a solitary hyperparasitoid, Mesochorus facialis.…”

Section: Study Systemmentioning

confidence: 99%

Do distances among host patches and host density affect the distribution of a specialist parasitoid?

2005

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“…Ragwort (Senecio jacobaea) is a plant of disturbed and open localities on light soils (Cameron 1935;Harper & Wood 1957). It may adopt a biennial life cycle.…”

Section: Introductionmentioning

confidence: 99%

The Population Ecology of Senecio Jacobaea in a Sand Dune System: I. Reproductive Strategy and the Biennial Habit

Meijden¹,

Waals-Kooi²

1979

The Journal of Ecology

177

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“…Competition from the local vegetation may prevent the plant from extending its range into the latter habitats. Cameron's (1935) conclusion that the plant will not stand intense competition from grasses supports this assumption.…”

Section: Soil Properties and Ragwort Distributionmentioning

confidence: 75%

The Distribution of Senecio Jacobaea L. And Tyria Jacobaeae L. In Relation to Soil Properties

Meijden¹

1974

Acta Botanica Neerlandica

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The distribution of S. jacobaea in The Netherlands is compared with local water-table depth, degree of drainage and calcium content. As surface units, hour squares (5.25 km x 5.25 km) are used. Water-table depth accounts for a greater part of the variance in the distribution of Ragwort than soil drainage. The variance accounted for by water-table depth and calcium content is of the same order. In the category of soils which have a low water level and are calcareous at the same time, Ragwort is very frequent (in 96 %of the squares).A significant relation of the distribution of the main consumer of Ragwort, T. jacobaeae, to soil drainage, as was found in England and Wales, could not be shown for The Netherlands. However, indications are given that egg distribution of T. jacobaeae is related to the area and density of Ragwort populations.

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A Study of the Natural Control of Ragwort (Senecio Jacobaea L.)

Cited by 94 publications

References 7 publications

Do distances among host patches and host density affect the distribution of a specialist parasitoid?

Do distances among host patches and host density affect the distribution of a specialist parasitoid?

The Population Ecology of Senecio Jacobaea in a Sand Dune System: I. Reproductive Strategy and the Biennial Habit

The Distribution of Senecio Jacobaea L. And Tyria Jacobaeae L. In Relation to Soil Properties

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