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Natural regulation of Delia radicum in organic cabbage production

Meyling, N.; Navntoft, S.; Philipsen, H. and Thorup-Kristensen, K. (2013) Natural regulation of Delia radicum in organic cabbage production. Agriculture, Ecosystem and Environment, 164, pp. 183-189.

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Summary

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.


EPrint Type:Journal paper
Subjects: Crop husbandry > Production systems
Soil > Soil quality > Soil biology
Crop husbandry > Production systems > Vegetables
Environmental aspects > Biodiversity and ecosystem services
Research affiliation: Denmark > DARCOF III (2005-2010) > VEGQURE - Organic cropping Systems for Vegetable production
Denmark > KU - University of Copenhagen > KU-LIFE - Faculty of Life Sciences
Deposited By: Kristensen, Ph.D. Hanne L.
ID Code:22837
Deposited On:11 Jun 2013 09:23
Last Modified:11 Jun 2013 09:23
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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