Natural regulation of Delia radicum in organic cabbage production

Nicolai Vitt Meyling; Søren Navntoft; Holger Frederik Philipsen; Kristian Thorup-Kristensen; Jørgen Eilenberg

doi:10.1016/j.agee.2012.09.019

Natural regulation of Delia radicum in organic cabbage production

Nicolai Vitt Meyling, Søren Navntoft, Holger Frederik Philipsen, Kristian Thorup-Kristensen, Jørgen Eilenberg

7 Citationer (Scopus)

46 Downloads (Pure)

Abstract

In a field experiment, we evaluated effects of three different organic white cabbage-cropping systems (O1, O2, O3) on the cabbage root fly, Delia radicum, and its egg predators and pupal parasitoids over 3 years. The three systems all complied with regulations for organic production, but varied in external nutrient input and N-recycling, and were compared to a conventionally farmed control. One organic system (O3) included an intercropped strip of green manure between crop rows. Oviposition by D. radicum was generally not reduced in organic cropping systems. However, higher pupae/egg ratios were observed in the conventional compared to all organic systems, indicating that immature survival from oviposition to pupation was reduced under all the three organic farming practices. In organic system O2 most small coleopteran predators were recorded, but predation on fly eggs was not significantly higher in organic treatments. Pupal parasitization rates ranged from 26.5% to 59.5%, but no significant differences among farming systems were found. Although reduced D. radicum survival could not be attributed solely to natural enemies, the results indicated that organic farming practices in general contribute to the suppression of belowground pests in cabbage production.

Originalsprog	Engelsk
Tidsskrift	Agriculture, Ecosystems & Environment
Vol/bind	164
Udgave nummer	1
Sider (fra-til)	183-189
Antal sider	7
ISSN	0167-8809
DOI	https://doi.org/10.1016/j.agee.2012.09.019
Status	Udgivet - 1 jan. 2013

Adgang til dokumentet

10.1016/j.agee.2012.09.019

Natural regulation of Delia radicum in organic cabbage productionForlagets udgivne version, 273 KB

http://www.sciencedirect.com/science/article/pii/S0167880912003611

Citationsformater

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abstract = "In a field experiment, we evaluated effects of three different organic white cabbage-cropping systems (O1, O2, O3) on the cabbage root fly, Delia radicum, and its egg predators and pupal parasitoids over 3 years. The three systems all complied with regulations for organic production, but varied in external nutrient input and N-recycling, and were compared to a conventionally farmed control. One organic system (O3) included an intercropped strip of green manure between crop rows. Oviposition by D. radicum was generally not reduced in organic cropping systems. However, higher pupae/egg ratios were observed in the conventional compared to all organic systems, indicating that immature survival from oviposition to pupation was reduced under all the three organic farming practices. In organic system O2 most small coleopteran predators were recorded, but predation on fly eggs was not significantly higher in organic treatments. Pupal parasitization rates ranged from 26.5% to 59.5%, but no significant differences among farming systems were found. Although reduced D. radicum survival could not be attributed solely to natural enemies, the results indicated that organic farming practices in general contribute to the suppression of belowground pests in cabbage production.",

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AU - Philipsen, Holger Frederik

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AU - Eilenberg, Jørgen

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