Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Tomato varieties used at present for commercial production in Dutch glasshouses have a high density of glandular trichomes on the stem, but a very low density on the leaves, The two-spotted spider mite, Tetranychus urticae Koch, and the predatory mite, Phytoseiulus persimilis AthiasHenriot, usually disperse from leaf to leaf via the stem, thereby incurring high risks of entrapment (and death) in the exudate of the glandular trichomes. These risks have been quantified on the tomato cv. 'Turbo' and an accession of Lycopersicon peruvianum almost free of glandular trichomes. The possible consequences for biological control are discussed and new perspectives for predator release strategies and for plant breeding are considered.

Filtering, ingestion, assimilation respiration, growth and reproduction of the blue mussel Mytilus edulis were successfully described in terms of a dynamic energy budget (DEB) model, which previously had been applied successfully to a variety of other species. The relation between oxygen consumption rate and ingestion rate could be derived from elementary model assumptions. Parameters of the DEB model, estimated for laboratory situations, were applied to field data. The varying growth rates in the field could be described by taking account of changes in food density and quality, and temperature, on the basis of the Arrhenlus relation. A methodology is given to reconstruct ambient food densities from observed growth curves. This can be used to assess the nutritive value of measured substances such as POM or chlorophyll. The concept Scope For Growth is discussed and Interpreted in terms of the DEB model. The energy conductance is found to be 0.36 mm.d "1 at 20"C, which is close to the mean of many species: 0.43 mm.d "1.

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Lupinus mutabilis is an important source of protein in different Andean countries, and its use in diets, particularly those of less wealthy individuals, has been observed for thousands of years. There is an increasing demand for protein crops suitable for Europe and this species is a potential candidate. Assessment of Lupinus mutabilis genetic material in European conditions started more than 40 years ago, with the characterization of a vast number of accessions from the Andean region. In this review, abiotic and biotic constraints to L. mutabilis cultivation in European soil and climatic conditions are discussed, and cultivation management practices are suggested. The beneficial interaction of L. mutabilis with Bradyrhizobium strains in the soil and various pollinator species is also discussed, and the effect of abiotic stresses on these interactions is highlighted. Prospects of alternative uses of L. mutabilis biomass in Northern Europe and opportunities for breeding strategies are discussed. In conclusion, the different approach to crop modeling for Southern and Northern European climatic conditions is highlighted.