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Titre :
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Effects of growth stage of resistant and susceptible barley on the Russian wheat aphid, Diuraphis noxia (Homoptera: Aphididae)
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Auteurs :
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J. Webster ;
D. Porter ;
J. Burd ;
D. Mornhinweg
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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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1996
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Format :
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283-291
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Langues:
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= Anglais
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Mots-clés:
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Homoptera
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Aphididae
;
Diuraphis noxia
;
Russian wheat aphid
;
plant resistance
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barley
;
Test de resistance
;
Mecanisme de resistance
;
Pherologie
;
taux de reproduction
;
Croissance ponderale
;
Hordeum murinum
;
Gramineae
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Résumé :
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The Russian wheat aphid, Diuraphis noxia (Mordvilko), is a serious pest of barley in western North America. To help manage this pest, a Russian wheat aphid-resistant germplasm line STARS-9301 B was recently released to barley breeders for incorporation into their cultivars. Information about the antixenosis and antibiosis mechanisms of resistance in the 1 st-leaf stage was previously reported, but information about these mechanisms of resistance in later plant growth stages has not been available. This study reports on antixenosis and antibiosis tests conducted under controlled conditions on three growth stages of STARS-9301 B and 'Morex', a Russian wheat aphid-susceptible malting barley cultivar. In general, aphid reactions in the later growth stages were similar to those on 1 st-leaf stage plants except that antixenosis was demonstrated in STARS-9301 B when data from all growth stages were combined. Antibiosis continues to contribute to resistance in more mature plants of STARS-9301 B. Previous work showed that tolerance is the most important resistance mechanism of STARS-9301 B seedlings. Tolerance data for comparing barley entries beyond the seedling stage are not available because a practical, uniform test to determine tolerance levels at these older plant growth stages has not been developed. The results of this study show that spring barley entries can be reliably tested in early growth stages for antixenosis and antibiosis to the Russian wheat aphid.
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Source :
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Journal of Agricultural Entomology - 0735-939 X, vol. 13, n° 4
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