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INFLUENCE OF TILLAGE SYSTEM, PLANTING DATE, AND OILSEED CRUCIFERS ON FLEA BEETLE POPULATIONS (COLEOPTERA: CHRYSOMELIDAE)

Published online by Cambridge University Press:  31 May 2012

Lindsey R. Milbrath
Affiliation:
Department of Entomology, North Dakota Agricultural Experiment Station, Fargo, North Dakota, USA 58105
Michael J. Weiss
Affiliation:
Department of Entomology, North Dakota Agricultural Experiment Station, Fargo, North Dakota, USA 58105
Blaine G. Schatz
Affiliation:
Carrington Research and Extension Center, Carrington, North Dakota, USA 58421

Abstract

Cultural practices (tillage, planting date) were examined for their effect on flea beetle, Phyllotreta cruciferae (Goeze), populations in three species of oilseed crucifers—Brassica napus L., B. rapa L., and Crambe abyssinica Hochst. No-till appeared to reduce flea beetle densities when compared with conventional tillage. The greater structural diversity of the no-till plots might be interfering with host plant location. Earlier plantings had significantly more flea beetles per plant than later plantings. The Brassica crops yielded higher densities of beetles compared with crambe, supporting earlier reports of crambe resistance.

Résumé

Les effets des procédures agricoles (labours, dates des plantations) sur les populations de l’Altise des crucifères, Phyllotreta cruciferae (Goeze), ont été étudiés chez trois espèces de crucifères oléagineuses, Brassica napus L., B. rapa L. et Crambe abyssinica Hochst. La densité des altises était réduite dans les champs non labourés par comparaison aux champs labourés de façon conventionnelle. La diversité structurale accrue dans les champs non labourés peut perturber la répartition des plants hôtes. Les plantations hâtives semblaient contenir plus d’altises que les plantations plus tardive. Les récoltes de Brassica ont donné des densités plus importantes d’altises que les récoltes de Crambe, ce qui semble confirmer la résistance des plants de Crambe signalée antérieurement.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1995

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