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751 results on '"Köhl J"'

202. Inventarisatie, voorspelling en beheersing zwarte vlekken ziekte in peen : projectrapport over het in 2003/2004 uitgevoerde onderzoek

Author

Wander, J.G.N., Elderson, J., Esselink, L.J., Huisman-de Lange, M., Kastelein, P., Köhl, J., Meier, R., Velema, R., Wander, J.G.N., Elderson, J., Esselink, L.J., Huisman-de Lange, M., Kastelein, P., Köhl, J., Meier, R., and Velema, R.

Abstract

Tussen en binnen de verschillende monsters vertoonden de penen een verscheidenheid aan aantastingbeelden. Van elk monster is van de daarin aangetroffen aantastingbeelden een representatief aantal laesies onderzocht op aanwezigheid van laesies. Bij 14% is een schimmel uitgegroeid waarvan bekend is dat deze zwarte vlekken kan veroorzaken. Naast schimmels, waren in de meest leasies ook bacterien aanwezig.

Published
2004

215. Alternaria in peen bij de bron bestrijden : biologische bestrijding van Alternaria radicini in de zaadproductie

Author

Molhoek, W., Köhl, J., Molhoek, W., and Köhl, J.

Abstract

Zwarte-vlekkenziekte, vaak veroorzaakt door de schimmel Alternaria radicini, is een toenemend probleem in de bewaring van peen. De schimmel kan worden overgedragen via zaad. Onderzoek van PRI op proefvelden van Rijk Zwaan BV toonde aan dat biologische bestrijding tijdens de zaadteelt, door de bloem te behandelen met de antagonistische schimmel Ulocladium atrum, effectief kan zijn

Published
2003

220. Biological control as a strategy to reduce the impact of mycotoxins in peanuts, grapes and cereals in Argentina.

Author

Chulze, S.N., Palazzini, J.M., Torres, A. M., Barros, G., Ponsone, M.L., Geisen, R., Schmidt-Heydt, M., and Köhl, J.

Subjects
MYCOTOXINS, PEANUTS, GRAPES, GRAIN, AFLATOXINS
Abstract

Mycotoxins including aflatoxins, deoxynivalenol, fumonisins and ochratoxin A are among the main fungal secondary metabolites detected as natural contaminants in South America in different commodities such as peanuts (aflatoxins), cereals (deoxynivalenol and fumonisins) or grapes (ochratoxin A). Different strategies including crop rotation, tillage practices, fungicide application and planting less susceptible cultivars are used in order to reduce the impact of these mycotoxins in both food and feed chains. The development of fungicide resistance in many fungal pathogens as well as rising of public concern on the risks associated with pesticide use led to the search for alternative environmentally friendly methods. Biological control of plant pathogens and toxigenic fungi offers an alternative that can complement chemical control in the frame of an integrated pest management to reduce the impact of mycotoxins in the food and feed chains. The advances made in Argentina on reducing the impact of toxigenic fungi and mycotoxins in peanut, grapes and cereals using the biocontrol strategy are summarised. Native bacteria, yeasts and filamentous fungi have been selected to evaluate them as potential biocontrol agents. Field trials showed thatBacillus subtilisRC 218 andBrevibacillussp. RC 263 were effective at reducing deoxynivalenol accumulation in wheat. The application ofClonostachys roseaisolates on wheat stubble reducedFusariumcolonisation on the stubble.Bacillus amyloliquefaciensandMicrobacterium oleovoransshowed good activity to control bothFusarium verticillioidesgrowth and the accumulation of fumonisins at pre-harvest stage in maize. Control of toxigenicAspergillus flavusand aflatoxin accumulation in peanuts was achieved using a native atoxigenicAspergillus flavusstrain based on competitive exclusion of the toxigenic strains.Kluyveromyces thermotoleransstrains were used as biocontrol agents to reduce the impact ofAspergillussectionNigriand ochratoxin A accumulation in grapes. [ABSTRACT FROM PUBLISHER]

Published
2015
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