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THE EFFECT OF TILLAGE REGIME ON EMERGENCE OF ROOT MAGGOTS (DELIA SPP.) (DIPTERA: ANTHOMYIIDAE) FROM CANOLA

Published online by Cambridge University Press:  31 May 2012

L.M. Dosdall ,
M.J. Herbut ,
N.T. Cowle  and
T.M. Micklich
L.M. Dosdall
Affiliation:
Alberta Research Council, PO Bag 4000, Vegreville, Alberta, Canada T9C 1T4
M.J. Herbut
Affiliation:
Alberta Research Council, PO Bag 4000, Vegreville, Alberta, Canada T9C 1T4
N.T. Cowle
Affiliation:
Alberta Research Council, PO Bag 4000, Vegreville, Alberta, Canada T9C 1T4
T.M. Micklich
Affiliation:
Alberta Research Council, PO Bag 4000, Vegreville, Alberta, Canada T9C 1T4
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Abstract

The effect of four tillage regimes on the emergence of root maggots (Delia spp.) (Diptera: Anthomyiidae) was determined on experimental plots seeded the previous year to either Brassica rupa L. or Brassica napus L. The tillage regimes evaluated comprised no tillage, tillage in the spring only, tillage in the fall only, and tillage in both the fall and the spring. Emergence trap collections of Delia radicum (L.) and Delia floralis (Fallén) were made from the experimental plots from early May to mid-July of 1991 and 1992. In both years, emergence from untilled plots significantly exceeded that from plots subjected to any other tillage treatment. Tillage resulted in a decrease in emergence of 55–64% for D. radicum, and reduction of 53–72% for D. floralis. For D. floralis, greatest reductions in emergence following a tillage treatment occurred in plots tilled only in the fall or in plots tilled in both the fall and the spring; however for D. radicum, tillage in the fall, the spring, and in both the fall and the spring reduced emergence to approximately the same extent. Results of our study indicated that canola growers in regions of high population densities of root maggot should cultivate infested fields, preferably in fall, to reduce the emergence success of Delia spp.

Résumé

Les effets de quatre régimes différents de labours sur l’émergence de Delia spp. (Diptera : Anthomyiidae) ont été étudiés dans des champs expérimentaux semés de Brassica rapa L. ou de Brassica napus L. au cours de l’année précédente. Il s’agissait de champs non labourés, de champs labourés au printemps seulement, de champs labourés à l’automne seulement ou de champs labourés au printemps et à l’automne. Les adultes de Delia radicum (L.), la Mouche du chou, et de Delia floralis (Fallén), la Mouche du navet, ont été récoltés dans les champs expérimentaux au moyen de pièges à émergence du début de mai au milieu de juillet, en 1991 et 1992. Au cours des 2 années, significativement plus d’insectes ont émergé dans les champs non labourés que dans tous les autres champs échantillonnés. Les labours ont entraîné une réduction de 56–64% des D. radicum et de 53–72% des D. floralis. Dans les champs cultivés, les D. floralis ont diminué surtout dans les champs labourés à l’automne et dans les champs labourés à l’automne et au printemps; dans le cas de D. radicum, les trois régimes de labours ont eu à peu près les mêmes effets. Les résultats de l’étude indiquent donc que les producteurs de colza dans les régions où abondent les larves de Delia spp. devraient labourer leurs champs infestés, de préférence à l’automne, pour réduire l’abondance des anthomyies à l’émergence.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 6 , December 1996 , pp. 1157 - 1165
Copyright
Copyright © Entomological Society of Canada 1996

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