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Development and assessment of direct control of Alternaria leaf blight (Alternaria dauci) in carrot cultivation for industrial processing
Project
Project code: 03OE488
Contract period: 31.03.2004
- 31.12.2006
Budget: 158,852 Euro
Purpose of research: Applied research
Within the BLE research project 'Development and assessment of direct control of Alternaria leaf blight (Alternaria dauci) in carrot cultivation for industrial processing' (03OE488), field trials were carried out from 2004 to 2006 to optimise the organic cultivation of carrots under the conditions in northern Germany.Variety comparison Different carrot varieties were tested at two trial locations regarding their suitability for organic cultivation. One of the criteria was the resistance against Alternaria. Clear differences concerning the susceptibility to Alternaria could be observed within the tested varieties. The trials showed that the varieties commonly used in organic cultivation proved to be less suitable than other tested varieties. When the conditions favoured infection, the high susceptibility to Alternaria of the standard varieties previously used, led to leaf damage which had an influence on the content of nitrate and the marketing quality of the product. Efficiency of hot water treatment (HWT) of seeds against leaf damage caused by Alternaria dauci Using high susceptible varieties of carrots it was tested whether the infection of carrot seeds with the fungus Alternaria dauci had an influence on the point of time and intensity of Alternaria infection of the carrot crop. Therefore, untreated low infected seeds and high infected seeds were compared to seeds treated with hot water. Higher infection rates with Alternaria dauci of the seeds led to higher occurrence of the leaf disease in the crop when the conditions favoured infection. Efficiency of different plant protective strengthening agents against Alternaria The direct effect of plant protective and strengthening agents against the infection with Alternaria dauci was tested. By using copper agents a significant effect on the Alternaria infection could be determined. This concerns both trials: the one based on copper hydroxide as well as the one based on copper octanoate. However, so far the agent copper octanoate has not been listed as permitted plant protective agent in the Annex of the Organic Farming Directive.
Section overview
Subjects
- Vegetable Gardening
Framework programme
Federal Organic Farming Scheme and other forms of sustainable agriculture (BÖLN)
Funding programme
Excutive institution
Competence Center of organic farming in Lower Saxony GmbH (KÖN)
