So what's the problem?
The swede midge (Contarinia nasturtii), a pest of Eurasian origin, was first detected in Ontario (Canada) in 2000. It causes severe damage to a wide variety of important cabbage crops such as broccoli, cabbage, cauliflower, turnips, radish, and canola. Swede midge larvae feed actively on the growth points and leaf stalks of cabbage plants, resulting in deformed plants, decreased seed production and reduced crop yield. Damage can reach up to 80% if crops are left untreated. In 2012, the swede midge was present in Quebec, Nova Scotia, Manitoba, and Saskatchewan, as well as five American states: New York, Massachusetts, New Jersey, Connecticut, and Ohio. Since arrival of the swede midge in the main cabbage growing areas of eastern Canada, pesticide applications in cabbage crops have increased, threatening already existing biological control programs against other cabbage pests.
What is this project doing?
Between 2008 and 2011 we comprehensively surveyed and identified potential classical biological control agents in Europe for introduction into North America. Levels of attack, however, were typically less than 10%. Since parasitoids do not seem to regulate the pest efficiently, we initiated life-table studies in Europe to identify other important biotic and abiotic mortality factors for the swede midge. Allowing mortality from a natural enemy to be compared with other sources of mortality, life-tables also allow the contribution to population regulation of a pest by a natural enemy to be assessed.
Results so far
Two different methods for studying life-table characteristics for swede midge were developed in 2012. The preliminary results of our first life table experiments indicate that swede midge suffers from high egg mortality. Studies in Switzerland will be continued in 2013.
Address: Rue des Grillons 1, CH-2800 Delemont, Switzerland
Tel: +41 (0)32 421 4882
Tel: +41 (0)32 4214883
Address: Bakeham Lane, Egham, Surrey, TW209TY, United Kingdom
Tel: +44 (0)1491 829037
Biological control of brown marmorated stink bug
Protecting leeks and onions from pests
Controlling the cabbage seedpod weevil in Canada
Crop rotation to control Diabrotica in Bavaria, Germany
Invasive Plant Ecology in Natural and Agricultural Systems
by B Booth, S Murphy, C Swanton
21 September 2010
Paperback / 9781845936051 / £37.50 / $72.50 / €50.00
Temperate and Subtropical Fruit Production
by D Jackson, N Looney, M Morley-Bunker, G Thiele
10 November 2010
Paperback / 9781845935016 / £39.95 / $75.00 / €50.00
Sustainable Livestock Management For Poverty Alleviation and Food Security
by D Bhandari, K van't Hooft, T Wollen
04 April 2012
Hardback / 9781845938277 / £75.00 / $145.00 / €100.00
AgBiotech News and Information
An excellent gateway to all current research on agricultural biotechnology
The complete online agricultural biotechnology information service that covers transgenics and tissue culture of plants and animals
Agricultural Engineering Abstracts
An excellent gateway to all current research on agricultural engineering