Alyokhin, A. & Sewell, G. (2003) On-soil movement and plant colonization by walking wingless morphs of three aphid species (Homoptera: Aphididae) in greenhouse arenas. Environmental Entomology 32, 1393–1398.
Blackman, R.L. & Eastop, V.F. (2000) Aphids on the World's Crops: An Identification and Information Guide. Chinester, UK, J. Wiley & Sons.
Boiteau, G. (1997) Comparative propensy for dispersal of apterous and alate morphs of three potato-colonizing aphid species. Canadian Journal of Zoology 75, 1396–1403.
Diaz, B.M. & Fereres, A. (2005) Life table and population parameters of Nasonovia ribisnigri (Homoptera: Aphididae) at different constant temperatures. Environmental Entomology 34, 527–534.
Dixon, A.F.G. (1987) Parthenogenetic reproduction and rate of increase in aphids. pp. 269–287in Minks, A.K. & Harrewijn, P. (Eds) Aphids: Their Biology, Natural Enemies and Control, vol. A. Amsterdam, The Netherlands, Elsevier.
Feller, C., Bleiholder, H., Buhr, L., Hack, H., Hess, M., Klose, R., Meier, U., Stauss, R., Van den Boom, T. & Weber, E. (1995) Phänologische Entwicklungsstadien von Gemüsepflanzen: I. Zwiebel-, Wurzel-, Knollen- und Blattgemüse. Nachrichtenblut Deutsche Pflanzenschutz 47, 193–206.
Feng, M. & Nowierski, R.M. (1992) Variation in spatial patterns of the Russian wheat aphid (Homoptera: Aphididae) among small grains in the northwestern United States. Environmental Entomology 21, 1029–1034.
Griffiths, G.K., Alexander, C.J., Holland, J.M., Kennedy, P.J., Perry, J.N., Symondson, C. & Winder, L. (2008) Monoclonal antibodies reveal changes in predator efficiency with prey spatial pattern. Molecular Ecology 17, 1828–1839.
Hodgson, C. (1991) Dispersal of apterous aphids (Homoptera: Aphididae) from their hot plant and its significance. Bulletin of Entomological Research 81, 417–427.
Irwin, M., Kampmeier, G.E. & Weisser, W.W. (2007) Aphid movement: process and consequences. pp. 153–186in Van Emden, H. & Harrington, R. (Eds) Aphids as Crop Pests. Harpenden, UK, Rothamsted Research.
Korie, S., Clark, S.J., Perry, J.N., Mugglestone, M.A., Barlett, P.W., Marshall, E.J.P. & Mann, J.A. (1998) Analyzing maps of dispersal around a single focus. Environmental and Ecological Statistics 5, 317–344.
Liu, Y.B. (2004) Distribution and population development of Nasonovia ribisnigri (Homoptera: Aphididae) in iceberg lettuce. Journal of Economic Entomology 97, 883–890.
Lombaert, E., Boll, R. & Lapchin, L. (2006) Dispersal strategies of phytophagous insects at a local scale: adaptative potential of aphids in an agricultural environment. Evolutionary Biology 6, 1–13.
Lopes, C., Spataro, T. & Arditi, R. (2010) Comparison of spatially implicit and explicit approaches to model plant infestation by insect pests. Ecological Complexity 7, 1–12.
Mackenzie, J.R. & Vernon, R.S. (1988) Sampling for distribution of the lettuce aphid, Nasonovia ribisnigri (Homoptera: Aphididae) in fields and within heads. Journal of Entomological Society of British Columbia 85, 10–14.
Moreno, A., Nebreda, M., Diaz, B.M., Garcia, M., Salas, F. & Fereres, A. (2007) Temporal and spatial spread of lettuce mosaic virus (LMV) in lettuce crops in central Spain. Annals of Applied Biology 150, 351–360.
Nebreda, M., Moreno, A., Pérez, N., Palacios, I., Seco-Fernández, V. & Fereres, A. (2004) Activity of aphids associated with lettuce and broccoli in Spain and their efficiency as vectors of lettuce mosaic virus. Virus Research 100, 83–88.
Palumbo, J.C. (2000) Seasonal abundance and control of the lettuce aphid, Nasonovia ribisnigri, on head lettuce in Arizona. 2000 Vegetable Report, University of Arizona, AZ, USA, College of Agriculture and Life Sciences. Available online at (http://ag.arizona.edu/pubs/crops/az1177/). Perry, J.N. (1995) Spatial analysis by distance indices. Journal of Animal Ecology 64, 303–314.
Perry, J.N. (1998) Measures of spatial pattern for counts. Ecology 79, 1008–1017.
Perry, J.N., Winder, L., Holand, J.M. & Alston, R.D. (1999) Red-blue plots for clusters in count data. Ecology Letters 2, 106–113.
Robert, Y. (1987) Dispersión and migration. pp. 299–314in Minks, A.K. & Harrewijn, P. (Eds) Aphids: Their Biology, Natural Enemies and Control, vol. A. Amsterdam, The Netherlands, Elsevier.
Scorsetti, A.C., Maciá, A., Steinkraus, D.C. & López Lastra, C.C. (2010) Prevalence of Pandora neoaphidis (Zygomycetes: Entomophthorales) infecting Nasonovia ribsinigri (Hemiptera: Aphididae) on lettuce crops in Argentina. Biological Control 52, 46–50.
Smyrnioudis, I.N., Harrington, R., Clark, S.J. & Katis, N. (2001) The effect of natural enemies on the spread of barley yellow dwarf virus (BYDV) by Rhopalosiphum padi (Hemiptera: Aphididae). Bulletin of Entomological Research 91, 301–306.
Southwood, T.R.F. & Henderson, P.A. (2000) Ecological Methods. 3rd edn. Oxford, UK, Blackwell Science Ltd.
SPSS (2003) SPSS statistical package, version 17.00, Chicago, IL, USA, SPSS Inc.