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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

Comparative D. citri flush infestation levels and densities on trees of inner and outer groves in the area-wide study sites (2009–2010).
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pone.0131917.g002: Comparative D. citri flush infestation levels and densities on trees of inner and outer groves in the area-wide study sites (2009–2010).

Mentions: The location of grove also significantly affected D. citri infestation and densities recorded on trees (Table 1). Groves located at the outer edge of the study area harbored significantly more psyllids and had more infested flush shoots than inner groves surrounded by other citrus blocks (Fig 2). Regardless of host plant species and time of the year, densities of D. citri adults, nymphs and eggs were respectively 1.4, 1.5 and 2.0-fold higher in outer groves than inner groves. Similarly, mean percentage of flush shoots infested throughout the study period was 1.4-fold higher in outer groves than inner ones.


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)

Comparative D. citri flush infestation levels and densities on trees of inner and outer groves in the area-wide study sites (2009–2010).
© Copyright Policy
Related In: Results  -  Collection

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

pone.0131917.g002: Comparative D. citri flush infestation levels and densities on trees of inner and outer groves in the area-wide study sites (2009–2010).
Mentions: The location of grove also significantly affected D. citri infestation and densities recorded on trees (Table 1). Groves located at the outer edge of the study area harbored significantly more psyllids and had more infested flush shoots than inner groves surrounded by other citrus blocks (Fig 2). Regardless of host plant species and time of the year, densities of D. citri adults, nymphs and eggs were respectively 1.4, 1.5 and 2.0-fold higher in outer groves than inner groves. Similarly, mean percentage of flush shoots infested throughout the study period was 1.4-fold higher in outer groves than inner ones.

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