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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

Mean number of D. citri adults caught on ACP-traps relative to tree position mature and young grapefruit groves in a field study (TAMUK-Citrus Center, 2012).
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pone.0131917.g004: Mean number of D. citri adults caught on ACP-traps relative to tree position mature and young grapefruit groves in a field study (TAMUK-Citrus Center, 2012).

Mentions: After two dormant sprays within a three-week period in January 2012, no adult psyllid was recovered from the two groves for three consecutive months (Fig 4). The first D. citri adults were caught on sticky traps in May and this initial D. citri detection on traps were made on the perimeter of the groves. Detection on D. citri adults on traps placed on adjacent and interior trees did not occur until 1 month after the initial detection on perimeter trees. Significantly more D. citri adults were caught on traps in the young grove compared to the mature grove (Fig 4). However, at all sampling dates, D. citri densities remained higher on perimeter than trees inside the grove (Fig 4). With the exception of one sampling date at the beginning of D. citri detection on interior trees in the mature grove, adjacent trees always harbored more psyllids than interior trees.


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)

Mean number of D. citri adults caught on ACP-traps relative to tree position mature and young 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.g004: Mean number of D. citri adults caught on ACP-traps relative to tree position mature and young grapefruit groves in a field study (TAMUK-Citrus Center, 2012).
Mentions: After two dormant sprays within a three-week period in January 2012, no adult psyllid was recovered from the two groves for three consecutive months (Fig 4). The first D. citri adults were caught on sticky traps in May and this initial D. citri detection on traps were made on the perimeter of the groves. Detection on D. citri adults on traps placed on adjacent and interior trees did not occur until 1 month after the initial detection on perimeter trees. Significantly more D. citri adults were caught on traps in the young grove compared to the mature grove (Fig 4). However, at all sampling dates, D. citri densities remained higher on perimeter than trees inside the grove (Fig 4). With the exception of one sampling date at the beginning of D. citri detection on interior trees in the mature grove, adjacent trees always harbored more psyllids than interior trees.

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