Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. Environmental Science Bibliography: leaves 82-87 The cabbage root maggot Delia radicum (L.) (Diptera: Anthomyiidae), particularly the second generation, is the most serious insect pest of rutabaga in Newfoundland. Cabbage root maggot larvae...
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ftmemorialunivdc:oai:collections.mun.ca:theses3/5421 2023-05-15T17:23:32+02:00 Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) Coady, Juanita R., 1969- Memorial University of Newfoundland.Environmental Science Programme Canada--Newfoundland and Labrador 1999 x, 87 leaves : col. ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses3/id/5421 eng eng Electronic Theses and Dissertations (8.79 MB) -- http://collections.mun.ca/PDFs/theses/Coady_JuanitaR.pdf a1477738 http://collections.mun.ca/cdm/ref/collection/theses3/id/5421 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Cabbage maggot--Control--Newfoundland and Labrador Aleochara--Newfoundland and Labrador Rutabaga--Newfoundland and Labrador Text Electronic thesis or dissertation 1999 ftmemorialunivdc 2015-08-06T19:17:37Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. Environmental Science Bibliography: leaves 82-87 The cabbage root maggot Delia radicum (L.) (Diptera: Anthomyiidae), particularly the second generation, is the most serious insect pest of rutabaga in Newfoundland. Cabbage root maggot larvae feed on the developing root and leave unsightly scars that reduce marketability. Undersowing rutabaga with white clover (Trifolium repens L. var. Sonja) was tested to determine the effects on cabbage root maggot adults, oviposition, rutabaga yield and marketability, carabid beetles and the root maggot predator/parasitoid Aleochara bilineata Gyll. (Coleoptera: Staphylinidae). -- Results of this study show that undersowing did have significant effects on the factors studied. The bare plots had more D. radicum females and eggs, A. bilineata (measured by both pitfall trapping and rate of parasitism), and some carabid species (Clivinafossor and Bembidion lampros). The undersown plots had higher total numbers of D. radicum of which most were males, and more of some carabid species (Pterostichus melanarius and Amara bifrons). There was a significant yield reduction in undersown compared to bare plots in 1997, and no rutabaga were marketable from either treatment. In 1998 when there was less pest pressure, yields were similar and a small percentage of rutabaga were marketable from both treatments. -- The rate of parasitism by A. bilineata was lower in the undersown plots, as observed by other researchers. An incubator study of fall-collected D. radicum pupae found peak D. radicum emergence occurred at 172 degree days (DD) and peak A. bilineata emergence occurred at 421 DD. above a base threshold of 4.4°C Survey collections showed that A. bilineata is present in all major growing areas of Newfoundland. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Canada Newfoundland |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Cabbage maggot--Control--Newfoundland and Labrador Aleochara--Newfoundland and Labrador Rutabaga--Newfoundland and Labrador |
spellingShingle |
Cabbage maggot--Control--Newfoundland and Labrador Aleochara--Newfoundland and Labrador Rutabaga--Newfoundland and Labrador Coady, Juanita R., 1969- Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) |
topic_facet |
Cabbage maggot--Control--Newfoundland and Labrador Aleochara--Newfoundland and Labrador Rutabaga--Newfoundland and Labrador |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. Environmental Science Bibliography: leaves 82-87 The cabbage root maggot Delia radicum (L.) (Diptera: Anthomyiidae), particularly the second generation, is the most serious insect pest of rutabaga in Newfoundland. Cabbage root maggot larvae feed on the developing root and leave unsightly scars that reduce marketability. Undersowing rutabaga with white clover (Trifolium repens L. var. Sonja) was tested to determine the effects on cabbage root maggot adults, oviposition, rutabaga yield and marketability, carabid beetles and the root maggot predator/parasitoid Aleochara bilineata Gyll. (Coleoptera: Staphylinidae). -- Results of this study show that undersowing did have significant effects on the factors studied. The bare plots had more D. radicum females and eggs, A. bilineata (measured by both pitfall trapping and rate of parasitism), and some carabid species (Clivinafossor and Bembidion lampros). The undersown plots had higher total numbers of D. radicum of which most were males, and more of some carabid species (Pterostichus melanarius and Amara bifrons). There was a significant yield reduction in undersown compared to bare plots in 1997, and no rutabaga were marketable from either treatment. In 1998 when there was less pest pressure, yields were similar and a small percentage of rutabaga were marketable from both treatments. -- The rate of parasitism by A. bilineata was lower in the undersown plots, as observed by other researchers. An incubator study of fall-collected D. radicum pupae found peak D. radicum emergence occurred at 172 degree days (DD) and peak A. bilineata emergence occurred at 421 DD. above a base threshold of 4.4°C Survey collections showed that A. bilineata is present in all major growing areas of Newfoundland. |
author2 |
Memorial University of Newfoundland.Environmental Science Programme |
format |
Thesis |
author |
Coady, Juanita R., 1969- |
author_facet |
Coady, Juanita R., 1969- |
author_sort |
Coady, Juanita R., 1969- |
title |
Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) |
title_short |
Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) |
title_full |
Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) |
title_fullStr |
Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) |
title_full_unstemmed |
Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) |
title_sort |
undersowing rutabaga (brassica napus l.) with white clover (trifolium repens l.) : effects on the cabbage root maggot (delia radicum (l.)) and its parasitoid/predator (aleochara bilineata gyll.) |
publishDate |
1999 |
url |
http://collections.mun.ca/cdm/ref/collection/theses3/id/5421 |
op_coverage |
Canada--Newfoundland and Labrador |
geographic |
Canada Newfoundland |
geographic_facet |
Canada Newfoundland |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (8.79 MB) -- http://collections.mun.ca/PDFs/theses/Coady_JuanitaR.pdf a1477738 http://collections.mun.ca/cdm/ref/collection/theses3/id/5421 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766113036344492032 |