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THE SPATIAL DISTRIBUTION OF LIMOTHRIPS DENTICORNIS HALIDAY (THYSANOPTERA: THRIPIDAE) EGGS ON SPRING BARLEY

Published online by Cambridge University Press:  31 May 2012

Barbara A. Bates  and
Michael J. Weiss
Barbara A. Bates
Affiliation:
Department of Entomology, North Dakota Agriculture Experiment Station, Fargo, North Dakota, USA 58105
Michael J. Weiss
Affiliation:
Department of Entomology, North Dakota Agriculture Experiment Station, Fargo, North Dakota, USA 58105
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Abstract

The within-plant spatial distribution of Limothrips denticornis Haliday eggs on spring barley (Hordeum vulgare L.) in North Dakota was examined during the growing seasons of 1987 and 1988. In both years, most eggs were found during inflorescence emergence (growth stages 10–10.5 on the Feekes scale), although eggs were detected both prior to and after these growth stages. Once inflorescence emergence was initiated, over 8.5% of the eggs were found in the top two leaf sheaths, with the majority in the flag leaf sheath. Over all barley growth stages, significantly more eggs (P≤0.05) were found in the middle third than in either the top or bottom third of the flag leaf sheath. No difference (P≥0.05) in the within-sheath location of eggs on lower leaves was detected.

Résumé

La distribution spatiale des oeufs de Limothrips denticornis Haliday en dedans des plantes de l’orge du printemps (Hordeum vulgare L.) a été étudiée pendant les saisons de croissance de 1987 et de 1988 au North Dakota. Pendant les 2 années, les oeufs ont été trouvés, pour la plupart, pendant l’apparition des inflorescences (les stades de croissance 10–10,5 sur l’échelle de Feekes), malgré qu’ils ont été découverts et avant et après ces stades de croissance. Une fois l’apparition d’inflorescences initiée, un pourcentage de plus de 8,5% des oeufs a été trouvé sur les deux enveloppes des feuilles du dessus de la plante, avec la plupart au fuseau de la feuille-étendard. À tous les stades de croissance de l’orge, les oeufs ont été trouvés en quantités significativement plus nombreuses au tiers du milieu qu’au tiers soit au-dessus, soit au-dessous du fuseau de la feuille-étendard (P≤0,05). Aucune différence n’a été trouvée (P≥0,05) parmi les locations d’oeufs en dedans du fuseau des feuilles basses des plantes.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 1 , February 1991 , pp. 205 - 210
Copyright
Copyright © Entomological Society of Canada 1991

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