The correlation between the transmission of passionfruit ringspot virus and populations of flying aphids (original) (raw)
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 winged_Aphis spiraecola_ trapped in yellow watertrays during the time of exposure.
Of all aphids trapped, 98% were_A. spiraecola_, colonizing predominantly_Eupatorium conyzoides_ (Compositae). This plant was found colonized everywhere in the forest area of Ivory Coast, which emphasizes the importance of_A. spiraecola_ as a potential virus vector in this part of Africa. The numbers of trapped_A. 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 van_Passiflora 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 jonge_Passiflora_ zaailingen die een overeenkomstige periode aan infectie in het veld hadden bloot gestaan.
Van het totaal aantal gevangen gevleugelde bladluizen bleek_Aphis spiraecola_ 98% uit te maken. Alleen deze bladluis werd verantwoordelijk gesteld voor de overdracht van het virus in het veld. Als waardplant voor_A. spiraecola_ dient voornamelijk het meerjarig onkruid_Eupatorium 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 van_A. spiraecola_, wat deze bladluis tot een belangrijke potentiële virusvector in dit deel van Afrika maakt.
De aantallen gevangen gevleugelde exemplaren van_A. 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
- J. J. De Wijs
Present address: CIBA-GEIGY AG, Agrochemicals Division, R 1207, CH-4002, Basel, Switzerland
Authors and Affiliations
- Office de la Recherche Scientifique et Technique Outre Mer (ORSTOM), Abidjan, Centre d'Adiopodoumé, Côte d'Ivoire
J. J. De Wijs & L. Bos
Authors
- J. J. De Wijs
- 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
- Accepted: 02 May 1974
- Issue date: July 1974
- DOI: https://doi.org/10.1007/BF01981377