M. F. J. Alderlieste

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A photoperiodic response was found to be absent in larvae of the parasitoid waspApanteles glomeratus when its host (caterpillars ofPieris brassicae) was reared on a low-carotenoid artificial diet. Addition of vitamin A to the host's diet restored the response to short-day photoperiods in the wasp larvae, thus showing that vitamin A is essential for(More)
A quantitative screening method based on enzyme-linked immunosorbent assay (ELISA) was developed for beet necrotic yellow vein virus (BNYVV). With respect to the assessment of the dose-response curve, the response-error relation, and the precision profile the choice of concentrations and replications per concentration was investigated. Special attention was(More)
Small differences in activity between batches of purified beet necrotic yellow vein virus (BNYVV) were observed in ELISA. A four-parameter modelled dose-response curve of purified BNYVV was used for the conversion of ELISA values to virus concentrations. Seedlings of the susceptible cultivar Regina and the partially resistant cultivars Nymphe and Rima were(More)
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