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Titre :
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Pea aphid (Homoptera: Aphididae) and water deficit interaction on alfalfa stem growth
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Auteurs :
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I. Badenhausser ;
R. Bournoville ;
R. Deval ;
J. Durand ;
J. Lerin
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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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1994
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Format :
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1689-1695
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Langues:
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= Anglais
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Mots-clés:
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Acyrthosiphon pisum
;
alfalfa
;
water deficit
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Résumé :
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The action of the pea aphid, Acyrthosiphon pisum (Harris), on alfalfa plants subjected to water deficit was investigated in a growth chamber. The main variable evaluated was the stem elongation rate (SER). The experimental conditions applied were suited to control and to measure plant water deficit and to evaluate aphid dynamics. The experiment was conducted over a 12-d period, beginning with the aphid infestation day (D-0). At the end of the experiment, leaf water potential (LWP) was -1 MPa and aphid population per stem was 225 aphids in the nonirrigated treatment and 300 aphids in the irrigated treatment. A significant decrease in SER was first caused by the aphid effect at 63 h after D-0, when populations reached on average 9.8 aphids per stem. Water deficit effect became significant at 188 h after D-0. The interaction between aphid effect and water deficit became significant 215 h after D-0. The possibility to relate SER to an optimum-rate SER(0) (SER of the noninfested irrigated stems), LWP and aphid infestation is discussed.
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Source :
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Journal of Economic Entomology - 0022-0493, vol. 87, n° 6
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