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Titre :
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A technique to quantitatively measure the leaf streaking symptom of Russian wheat aphid infestation
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Auteurs :
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H. Miller ;
D. Porter
|
|
Type de document :
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article/chapitre/communication
|
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Année de publication :
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1997
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Format :
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278-280
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Langues:
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= Anglais
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Mots-clés:
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Symptome
;
Degat
;
Diuraphis noxia
;
Hordeum vulgare
;
Gramineae
;
Cereale
;
Aphididae
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Résumé :
|
One of several symptoms of Russian wheat aphid (RWA) [Diuraphis noxia (Mordvilko)] damage in susceptible barley (Hordeum vulgare L.) is white or chlorotic streaking of the leaf. Current methods use several symptoms to qualitatively rate damage. We have developed a simple, inexpensive, and non-destructive technique to quantitatively measure streaking. The technique uses a series of small contiguous circles photocopied onto a clear plastic sheet to help quantify the percentage of leaf streaked. Measurements of streaking can be done within a week after infestation, and require no other specialized instrumentation. The series of circles technique allowed us to confirm and quantify some previously observed patterns of the streaking response concerning location and amount of streaking in relation to aphid age, location, and feeding duration. This technique could be used in physiological and genetic studies of the plant's response to insect stress.
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Source :
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Crop Science - 0011-183 X, vol. 37, n° 1
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