Titre :
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Temporal and spatial distribution patterns of aphids (Homoptera: Aphididae) on celery
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Auteurs :
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L. Godfrey ;
W. Chaney
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Type de document :
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article/chapitre/communication
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Année de publication :
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1995
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Format :
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294-301
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Langues:
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= Anglais
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Mots-clés:
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aphids
;
distribution
;
celery
;
Repartition spatiale
;
Repartition spatio-temporelle
;
Relation de Taylor
;
Piegeage
;
Dynamique des populations
;
Aphididae
;
Dysaphis apiifolia
;
Apium graveolens
;
Myzus persicae
;
Aphis fabae
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Résumé :
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Populations of aphids, which could cause economic losses from produce contamination, infested celery plants in fields in the central coast area of California. Densities of aphids were higher in the fall cropping period (4 August to 26 October 1992) as compared with the spring cropping period (14 April to 6 July 1992). Aphid population densities peaked at 640.5 per plant on 22 September. Aphid populations were clumped on celery plants as indicated with Taylor's power law; b values of 1.58 and 1.69 were found in the spring and fall celery crops, respectively (overall b value of 1.68). Petioles of intermediate maturity generally had the highest and most consistent aphid population levels, as compared with older and younger petioles and with growing point and sucker tissue. This plant region appears to be most conducive for sampling. Ten species of aphids were collected from celery plants; Dysaphis apiifolia (Theobald) was the most common aphid species in the spring and fall crops. Myzus persicae (Sulzer) and Aphis fabae Scopoli were also relatively common aphid species infesting celery plants. Aphid captures in water pan traps and on yellow sticky traps appeared indicative of aphid densities on celery plants. In both crops, as aphid levels from the traps increased, densities on the plants increased the same sample week ol the next sample week. Significant correlations were found between aphid densities from sticky traps and plant samples.
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Source :
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Journal of Economic Entomology - 0022-0493, vol. 88, n° 2
|