The use of incidence counts for estimation of cereal aphid populations. 3. Population development and the incidencedensity relation |
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| Authors: | S A Ward K D Sunderland R J Chambers A F G Dixon |
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| Institution: | (1) School of Biological Sciences, University of East Anglia, NR4 7TJ Norwich, UK;(2) Glasshouse Crops Research Institute, Rustington, BN16 3PU Littlehampton, W. Sussex, UK;(3) Department of Theoretical Production Ecology, Agricultural University, P.O. Box 430, 6700 AK Wageningen, the Netherlands |
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| Abstract: | The relation between the population density of the cereal aphid,Sitobion avenae, and the proportion of wheat tillers infested is examined. Three of the six models considered require the assumption that the aphids' spatial configuration can be described by a single statistical distribution; as this is not true forS. avenae these models are unsuitable. When the other three models were applied to field sample data, only that of Nachman (1981) yielded a regression equation that remained constant throughout the development of the aphid population.Samenvatting Om in de praktijk gebruik te kunnen maken van incidentie (de fractie bezette halmen) voor het schatten van graanluispopulaties moet dezelfde relatie tussen dichtheid en incidentie tijdens het hele groeiseizoen gelden. Uit analyses van veldgegevens voor de graanluisSitobion avenae blijkt dat wel het geval te zijn, zodat bepalingen van incidentie kunnen worden gebruikt om de populatiedichtheid betrouwbaar te schatten. |
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| Keywords: | Sitobion avenae wheat |
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