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Living on the Edges: Spatial Niche Occupation of Asian Citrus Psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), in Citrus Groves.

Sétamou M, Bartels DW - PLoS ONE (2015)

Bottom Line: In both cultivars, significantly more psyllids were found on perimeter trees throughout the study period suggesting a strong edge effect in D. citri distribution in the groves.Citrus groves located at the outer edge of the study with at least one side non-surrounded to other citrus groves harbored significantly more D. citri than groves located within the block cluster and entirely surrounded by other groves.In addition, psyllid densities decreased significantly with increasing distance from the grove edge.

View Article: PubMed Central - PubMed

Affiliation: Department of Agriculture, Agribusiness and Environmental Sciences, Texas A&M University-Kingsville Citrus Center, Weslaco, Texas, United States of America.

ABSTRACT
The spatial niche occupation of the Asian citrus psyllid, Diaphorina citri Kuwayama, 1908, was evaluated to determine its field colonization and food resource exploitation strategies in citrus groves. Mature grapefruit and sweet orange groves were surveyed as part of an area-wide program in 2009-2010 to determine D. citri population densities and between-tree distribution. In both cultivars, significantly more psyllids were found on perimeter trees throughout the study period suggesting a strong edge effect in D. citri distribution in the groves. D. citri densities and infestation levels gradually declined from the edge to the center of grove. Higher numbers of D. citri were recorded on trees located on the east and south sides of the groves than those on the west and north sides. Citrus groves located at the outer edge of the study with at least one side non-surrounded to other citrus groves harbored significantly more D. citri than groves located within the block cluster and entirely surrounded by other groves. In detailed field studies during 2012, infestation of D. citri started from border trees in the grove where possibly one generation is completed before inner trees become infested. In addition, psyllid densities decreased significantly with increasing distance from the grove edge. Using the selection index, D citri exhibited a strong niche occupation preference for border trees.

No MeSH data available.


Related in: MedlinePlus

Contour maps of D. citri adults caught on ACP-traps deployed at different positions in young and mature grapefruit groves in a field study (TAMUK-Citrus Center, 2012).
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pone.0131917.g005: Contour maps of D. citri adults caught on ACP-traps deployed at different positions in young and mature grapefruit groves in a field study (TAMUK-Citrus Center, 2012).

Mentions: The contour maps of D. citri adults trapped based on EBK clearly showed the preference for young citrus over mature plants and for perimeter trees (Fig 5). D. citri detection began on the southeastern edge of the young citrus grove and numbers increased to peak levels in September in the young grove. D. citri adults were detected on interior trees, but at lower numbers than on the perimeter trees. In the mature citrus, all the D. citri adults were captured on the perimeter traps, with the exception of one individual on an interior trap in August (Fig 4). By October, numbers of adults caught on traps were receding back to the perimeter (Figs 4 and 5).


Living on the Edges: Spatial Niche Occupation of Asian Citrus Psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), in Citrus Groves.

Sétamou M, Bartels DW - PLoS ONE (2015)

Contour maps of D. citri adults caught on ACP-traps deployed at different positions in young and mature grapefruit groves in a field study (TAMUK-Citrus Center, 2012).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507854&req=5

pone.0131917.g005: Contour maps of D. citri adults caught on ACP-traps deployed at different positions in young and mature grapefruit groves in a field study (TAMUK-Citrus Center, 2012).
Mentions: The contour maps of D. citri adults trapped based on EBK clearly showed the preference for young citrus over mature plants and for perimeter trees (Fig 5). D. citri detection began on the southeastern edge of the young citrus grove and numbers increased to peak levels in September in the young grove. D. citri adults were detected on interior trees, but at lower numbers than on the perimeter trees. In the mature citrus, all the D. citri adults were captured on the perimeter traps, with the exception of one individual on an interior trap in August (Fig 4). By October, numbers of adults caught on traps were receding back to the perimeter (Figs 4 and 5).

Bottom Line: In both cultivars, significantly more psyllids were found on perimeter trees throughout the study period suggesting a strong edge effect in D. citri distribution in the groves.Citrus groves located at the outer edge of the study with at least one side non-surrounded to other citrus groves harbored significantly more D. citri than groves located within the block cluster and entirely surrounded by other groves.In addition, psyllid densities decreased significantly with increasing distance from the grove edge.

View Article: PubMed Central - PubMed

Affiliation: Department of Agriculture, Agribusiness and Environmental Sciences, Texas A&M University-Kingsville Citrus Center, Weslaco, Texas, United States of America.

ABSTRACT
The spatial niche occupation of the Asian citrus psyllid, Diaphorina citri Kuwayama, 1908, was evaluated to determine its field colonization and food resource exploitation strategies in citrus groves. Mature grapefruit and sweet orange groves were surveyed as part of an area-wide program in 2009-2010 to determine D. citri population densities and between-tree distribution. In both cultivars, significantly more psyllids were found on perimeter trees throughout the study period suggesting a strong edge effect in D. citri distribution in the groves. D. citri densities and infestation levels gradually declined from the edge to the center of grove. Higher numbers of D. citri were recorded on trees located on the east and south sides of the groves than those on the west and north sides. Citrus groves located at the outer edge of the study with at least one side non-surrounded to other citrus groves harbored significantly more D. citri than groves located within the block cluster and entirely surrounded by other groves. In detailed field studies during 2012, infestation of D. citri started from border trees in the grove where possibly one generation is completed before inner trees become infested. In addition, psyllid densities decreased significantly with increasing distance from the grove edge. Using the selection index, D citri exhibited a strong niche occupation preference for border trees.

No MeSH data available.


Related in: MedlinePlus