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The correlation between the transmission of passionfruit ringspot virus and populations of flying aphids

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Abstract

The percentage of passionfruit ringspot virus infection in batches of young passionfruit seedlings exposed in the open in a plot of diseased fully grown passionfruits was significantly correlated with the number of wingedAphis spiraecola trapped in yellow watertrays during the time of exposure.

Of all aphids trapped, 98% wereA. spiraecola, colonizing predominantlyEupatorium conyzoides (Compositae). This plant was found colonized everywhere in the forest area of Ivory Coast, which emphasizes the importance ofA. spiraecola as a potential virus vector in this part of Africa. The numbers of trappedA. spiraecola were positively correlated with the preceding rainfall in mm with an interval of two weeks before the assessment. The influence of a period of rainfall lasted four to six weeks.

Samenvatting

‘Passionfruit ringspot virus’ (PRV) werd in Ivoorkust in het veld zeer snel verspreid van oudere zieke naar gezonde jonge zaailingen vanPassiflora edulis, de passievrucht.P. edulis zelf bleek geen waardplant te zijn voor eventuele vectoren. De aantallen gevleugelde bladluizen, gevangen in gele vangbakken gedurende een bepaalde periode, bleken echter significant gecorreleerd te zijn met de percentages zieke planten van groepen jongePassiflora zaailingen die een overeenkomstige periode aan infectie in het veld hadden bloot gestaan.

Van het totaal aantal gevangen gevleugelde bladluizen bleekAphis spiraecola 98% uit te maken. Alleen deze bladluis werd verantwoordelijk gesteld voor de overdracht van het virus in het veld. Als waardplant voorA. spiraecola dient voornamelijk het meerjarig onkruidEupatorium conyzoides (Compositae), dat zeer algemeen voorkomt in de omgeving van de proefvelden van het ORSTOM. Ook elders in de regenbos-zone van Ivoorkust wordt deze plant algemeen aangetroffen met kolonies vanA. spiraecola, wat deze bladluis tot een belangrijke potentiële virusvector in dit deel van Afrika maakt.

De aantallen gevangen gevleugelde exemplaren vanA. spiraecola waren significant gecorreleerd met de twee weken daaran voorafgaande neerslaghoeveelheden. De invloed van een regenperiode hield 4–6 weken aan.

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Author notes

  1. J. J. De Wijs

    Present address: CIBA-GEIGY AG, Agrochemicals Division, R 1207, CH-4002, Basel, Switzerland

Authors and Affiliations

  1. Office de la Recherche Scientifique et Technique Outre Mer (ORSTOM), Abidjan, Centre d'Adiopodoumé, Côte d'Ivoire

    J. J. De Wijs & L. Bos

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  1. J. J. De Wijs
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  2. L. Bos
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De Wijs, J.J., Bos, L. The correlation between the transmission of passionfruit ringspot virus and populations of flying aphids. Netherlands Journal of Plant Pathology 80, 133–144 (1974). https://doi.org/10.1007/BF01981377

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