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Canola, Natural Enemies, Root Maggots

Subramaniam, Ravindran

Supervisor and department: Dosdall, Lloyd Department of Agricultural, Food and Nutritional Science

Examining committee member and department: O'Donovan, John Agri-Food Canada, Lacombe Research Station Keddie, Andrew Department of Biological Science Spaner, Dean Department of Agricultural, Food and Nutritional Science

Department: Department of Agricultural, Food, and Nutritional Science

Specialization:

Date accepted: 2010-07-09T19:17:54Z

Graduation date: 2010-11

Degree: Master of Science

Degree level: Master's

Abstract: Yield losses from infestations of root maggots Delia spp. Diptera: Anthomyiidae can be severe in canola crops in central Alberta. Studies were undertaken in central Alberta, Canada to manipulate agronomic practices that have potential to affect crop yield, root maggot infestations, and the survival and abundance of Aleochara bilineata Coleoptera: Staphylinidae, which is an important natural enemy of root maggots. I investigated tillage regime conventional versus zero tillage, row spacing, and seeding rate to assess effects on Delia spp. and A. bilineata populations. In general I observed greater root maggot incidence and damage, and greater activity density of A. bilineata, in plots subjected to a conventional tillage regime than in a zero tillage regime. I found relatively greater parasitism of root maggot puparia by A. bilineata in plots subjected to a zero tillage regime than a conventional tillage regime. No consistent effects were observed on A. bilineata activity in relation to seeding rate and row spacing. In this study, there is no evidence to conclude that tillage regime had a significant effect on canola seed yield. Seed yields in relation to seeding rate and row spacing were variable. In the context of integrated pest management in canola cropping systems, I suggest that canola growers utilize zero tillage in conjunction with adopting the currently recommended seeding rates of between 5.6 to 9.0 kg per ha and row spacing of 30 cm because this can bring advantages in terms of improved management of root maggots and other important canola pests like flea beetles and weeds.

Language: English

DOI: doi:10.7939-R33Q69

Rights: Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.





Autor: Subramaniam, Ravindran

Fuente: https://era.library.ualberta.ca/


Introducción



University of Alberta Identifying Agronomic Practices that Conserve and Enhance Natural Enemies of Root Maggots (Delia spp.) (Diptera: Anthomyiidae) in Canola by Ravindran Subramaniam A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Plant Science Department of Agricultural, Food and Nutritional Sciences ©Ravindran Subramaniam Fall 2010 Edmonton, Alberta Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only.
Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the authors prior written permission. Examining Committee Dr.
Lloyd M.
Dosdall, Department of Agricultural, Food and Nutritional Science Dr.
B.
Andrew Keddie, Department of Biological Science Dr.
Dean Spaner, Department of Agricultural, Food and Nutritional Science Dr.
John ODonovan, Agri-Food Canada, Lacombe Research Station. Abstract Yield losses from infestations of root maggots (Delia spp.) (Diptera: Anthomyiidae) can be severe in canola crops in central Alberta.
Studies were undertaken in central Alberta, Canada to manipulate agronomic practices that have potential to affect crop yield, root maggot infestations, and the survival and abundance of Aleochara bilineata (Coleoptera: Staphylinidae), which is an important natural enemy of root maggots.
I investigated tillage regime (conventional versus zero tillage), row spacing, and seeding rate to assess effects on Deli...





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