The spatial and temporal distribution of the grain aphid Sitobion avenae in winter wheat

Abstract

The spatial and temporal distribution of the grain aphid Sitobion avenae F. (Homoptera: Aphididae) was studied within a field of winter wheat during the summer of 1996. Sampling was done using four nested grids comprising 133 locations. Analysis by Taylor's power law gave results typical for insect populations. Analysis by SADIE (Spatial Analysis by Distance Indices) showed spatial pattern due to edge effects and sampling scale, and positive but mild spatial association, although spatial patterns were ephemeral. Reasons for these findings and the implications for integrated crop management are discussed.

Edge-biased distributions of insects. A review

“…Another large-scale spatial distribution study of common farmland arthropods in winter wheat fields also demonstrated higher density of species along edges . The studies by Winder et al (1999) and Holland et al (1999) noted the effervescent occurrence of edge-biased distributions. These findings agree with Wilson and Morton (1993) who showed that edgebiased distribution of two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), in cotton was only prominent early in the growing season but eventually diminished as the season progressed.…”

“…The author noted that the onset of infestations by black bean aphids was near field edges and eventually spread throughout the field, although field edges would be the areas with the highest aphid density. Winder et al (1999) conducted a large-scale study of the effect of grid size on the analysis of the spatial distribution of English grain aphids, Sitobion avenae Fabricius (Hemiptera: Aphididae) and found that significant edge effect was detected for large grid size with higher count of aphids along field edges. However, the edge-biased distribution was not evident at small grid sizes.…”

Spatially-Optimized Sequential Sampling Plan for Cabbage AphidsBrevicoryne brassicaeL. (Hemiptera: Aphididae) in Canola Fields

“…Nematollahi et al (2014) did, however, recognize the need to stratify fields to reduce variability. Edge effect spatial patterns of arthropods in field crops and their importance within sampling plans has been identified in many arthropod species (Cusson et al 1990, Winder et al 1999, Ferguson et al 2003. Edge effects in large fields typically result in zero-inflated data sets wherein most data points, which are positioned in the field interior, contain few or no detectable cabbage aphid populations.…”

“…Many arthropod pests, including aphids, have exhibited aggregated spatial distributions (Trumble 1982, Feng and Nowierski 1992, Powell et al 2006, which are caused by factors such as land topography (Hill and Mayo 1980), distance from crop edge (Winder et al 1999, Nansen et al 2005, and plant phenology, including growth stage (Ferguson et al 2003) and leaf age (Kennedy and Booth 1951). This information may be useful in reducing sampling effort and increasing sampling accuracy for emerging infestations of arthropods in broad-scale fields, wherein sampling is targeted toward plant parts and field regions where the arthropods are most likely to occur.…”

Landscape scale study of diversity and interaction in cereal aphids - parasitoids system (Homoptera; Hymenoptera)

“…Podaci iz literature nisu brojni, ali ukazuju da postoji značajna varijabilnost u rasporedu biljnih vašiju u polju. Tako na primer, prema studijama Winder et al (1999) i Al Hassan et al (2013), biljne vaši su brojnije u ivičnoj zoni polja, dok su prema Ruggle & Holst (1995), Bowie et al(1999) i Fievet et al (2007 brojnije u centru ili pak ne postoji nikakav očigledni obrazac njihove distribucije (Winder et al, 2005).…”