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Interplant movement and spatial distribution of alate and apterous morphs of Nasonovia ribisnigri (Homoptera: Aphididae) on lettuce

Published online by Cambridge University Press:  31 January 2012

B.M. Diaz ,
L. Barrios  and
A. Fereres
B.M. Diaz*
Affiliation:
Departamento de Protección Vegetal, Instituto de Ciencias Agrarias, (ICA-CSIC), C/Serrano 115 Dpdo., Madrid 28006, Spain
L. Barrios
Affiliation:
Centro Técnico de Informática (CTI-CSIC). C/Pinar 24, Madrid 28006, Spain
A. Fereres
Affiliation:
Departamento de Protección Vegetal, Instituto de Ciencias Agrarias, (ICA-CSIC), C/Serrano 115 Dpdo., Madrid 28006, Spain
*
*Author for correspondence Fax: +34-91-5640800 E-mail: beatriz.diazdesani@gmail.com
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Abstract

Knowledge on colonization modes and interplant movement of Nasonovia ribisnigri can contribute to the development of optimal control of this pest. The aim of this study was to determine the spatio-temporal distribution and the mode of spread between adult morphs of Nasonovia ribisnigri, comparing spring and autumn lettuce protected crops. The spatial and temporal pattern was analyzed using the spatial analysis by distance indices (SADIE) methodology and other related displacement indices.

The population size of N. ribisnigri was greater in the autumn than in the spring growing seasons due to milder temperatures. The percentage of plants colonized by aphids was higher in spring than in autumn, showing the great dispersal potential of this aphid species independent of their population size. Differential propensity for initial displacement from the central plant was observed between adult morphs in spring, resulting in a greater ability of apterous than alate aphids to spread far away from the source plant. In autumn, both adult morphs showed an initial reduced displacement; however, the number of plants infested (≈20%) with at least one aphid at this initial time (seven days) was similar for both adult morphs and both growing seasons. Analysis of the spatial pattern of both adult morphs revealed a predominantly random distribution for both spring and autumn trials. This pattern was achieved by a prevalent random movement over the area (γ≈0.5). These results highlight the ability of the apterous N. ribisnigri to spread within greenhouse lettuce crops early in the spring, suggesting that detection of the pest by deep visual inspection is required after lettuce emergence.

Keywords

lettuce aphidinterplant movementspatial distributionpopulation ecologySADIE analysis
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 102 , Issue 4 , August 2012 , pp. 406 - 414
Copyright
Copyright © Cambridge University Press 2012

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