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  • Prediction of the density of aphids in alfalfa based on presence-absence sampling.

    Foreign Title : Predicción de la densidad de pulgones en alfalfa a partir de un muestreo presencia-ausencia.

    Author(s) : Comas, J.Pons, X.

    Author Affiliation : Escola Superior dAgricultura de Barcelona, Consorci Escola Industrial de Barcelona (CEIB), Urgell, 187, 08036 Barcelona, Spain.

    Journal article : Boletín de Sanidad Vegetal, Plagas 2000 Vol.26 No.4, Supplement pp.723-729 ref.8

    Abstract : Standard methods of estimating mean aphid density in lucernelucerneSubject Category: Commodities and Products
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    lucerneSubject Category: Commodities and Products
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    based on field counts where related to presence-absence samplingsamplingSubject Category: Techniques, Methodologies and Equipment
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    . Twenty-one random samples of 75 tillerstillersSubject Category: Anatomical and Morphological Structures
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    taken from lucerne commercial fields in Lleida (Ebro River valley), in SpainspainSubject Category: Geographic Entities
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    , were obtained in order to compare the estimation of mean aphid density and the estimation of the proportion of infested tillers. The empirical relationship between aphid density and its sampling variance using Taylor's potential law was satisfactory. The empirical relationship between and its variance shows that the distribution of infested tillers is practically binomial. The empirical relationship between aphid density and infested tillers developed using parameters from the linear regression of ln(aphid density) on ln(-ln infested tillers) was satisfactory. Mean aphid density estimation up to 20 aphids per tiller is possible using presence-absence sampling.

    ISSN : 0213-6910

    Record Number : 20013152679

    Publisher : Ministerio de Agricultura, Pesca y Alimentación

    Location of publication : Madrid

    Country of publication : Spain

    Language of text : Spanish

    Language of summary : English

    Indexing terms for this abstract:

    Organism descriptor(s) : AphidoideaaphidoideaSubject Category: Organism Names
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    , MedicagomedicagoSubject Category: Organism Names
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    , Medicago sativamedicago sativaSubject Category: Organism Names
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    Descriptor(s) : lucernelucerneSubject Category: Commodities and Products
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    , population densitypopulation densitySubject Category: Properties
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    , samplingsamplingSubject Category: Techniques, Methodologies and Equipment
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    , surveyssurveysSubject Category: Techniques, Methodologies and Equipment
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    , tillerstillersSubject Category: Anatomical and Morphological Structures
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    Identifier(s) : alfalfaalfalfaSubject Category: Commodities and Products
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    , sampling techniques

    Geographical Location(s) : SpainspainSubject Category: Geographic Entities
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    Broader term(s) : SternorrhynchasternorrhynchaSubject Category: Organism Names
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    , HemipterahemipteraSubject Category: Organism Names
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    , insectsinsectsSubject Category: Organism Names
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    , HexapodahexapodaSubject Category: Organism Names
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    , arthropodsarthropodsSubject Category: Organism Names
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    , invertebratesinvertebratesSubject Category: Organism Names
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    , animalsanimalsSubject Category: Organism Names
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    , eukaryoteseukaryotesSubject Category: Organism Names
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    , PapilionoideaepapilionoideaeSubject Category: Organism Names
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    , FabaceaefabaceaeSubject Category: Organism Names
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    , FabalesfabalesSubject Category: Organism Names
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    , eudicotseudicotsSubject Category: Organism Names
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    , angiospermsangiospermsSubject Category: Organism Names
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    , SpermatophytaspermatophytaSubject Category: Organism Names
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    , plantsplantsSubject Category: Organism Names
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    , MedicagomedicagoSubject Category: Organism Names
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    , Developed Countriesdeveloped countriesSubject Category: Miscellaneous
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    , European Union Countrieseuropean union countriesSubject Category: Institutions and Organisations
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    , Mediterranean Regionmediterranean regionSubject Category: Biogeographic Regions
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    , OECD Countriesoecd countriesSubject Category: Institutions and Organisations
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    , Southern Europesouthern europeSubject Category: Geographic Entities
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    , EuropeeuropeSubject Category: Geographic Entities
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