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The influence of size and duration of aphid infestation on host plant quality and its effect on sugar beet yellowing virus epidemiology

I. Williams ; A. Dewar ; A. Dixon | 1998

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The role of nutrition, crowding and interspecific interactions in the development of winged aphids

C. Muller ; I. Williams ; J. Hardie | 2001

1. Winged morph production in aphids is a phenotypic trait that has traditionally been seen as a response to unfavourable environmental conditions. The evidence to support this theory is reviewed and the ecological and evolutionary significance [...]

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The role of resources and natural enemies in determining the distribution of an insect herbivore population

I. Williams ; T. Jones ; S. Hartley | 2001

1. Both resources and natural enemies can influence the distribution of a herbivore. The ideal free distribution predicts that herbivores distribute themselves to optimise utilisation of resources. There is also evidence of herbivores seeking ou[...]

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