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

Identifieur interne : 000562 ( Main/Exploration ); précédent : 000561; suivant : 000563

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

Auteurs : Mamoudou Sétamou [États-Unis] ; David W. Bartels [États-Unis]

Source :

RBID : PMC:4507854

English descriptors

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.


Url:
DOI: 10.1371/journal.pone.0131917
PubMed: 26193111
PubMed Central: 4507854


Affiliations:


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Le document en format XML

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<p>The spatial niche occupation of the Asian citrus psyllid,
<italic>Diaphorina citri</italic>
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
<italic>D</italic>
.
<italic>citri</italic>
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
<italic>D</italic>
.
<italic>citri</italic>
distribution in the groves.
<italic>D</italic>
.
<italic>citri</italic>
densities and infestation levels gradually declined from the edge to the center of grove. Higher numbers of
<italic>D</italic>
.
<italic>citri</italic>
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
<italic>D</italic>
.
<italic>citri</italic>
than groves located within the block cluster and entirely surrounded by other groves. In detailed field studies during 2012, infestation of
<italic>D</italic>
.
<italic>citri</italic>
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,
<italic>D citri</italic>
exhibited a strong niche occupation preference for border trees.</p>
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