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See detailgestion intégrée des adventices en grandes cultures
Jaunard, Delphine ULg

Scientific conference (2013, May 30)

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See detailIntegrated management of wild chamomile populations by tillage
Jaunard, Delphine ULg; Monty, Arnaud ULg; Mahy, Grégory ULg et al

in Agricultural and Apllied Biological Sciences (2013, May 21)

Gembloux, Belgium Chemical weeding in agriculture increasingly raises environmental, health and economic preoccupations. European authorities has set up legislations (directive 91/414, settlement 1107 ... [more ▼]

Gembloux, Belgium Chemical weeding in agriculture increasingly raises environmental, health and economic preoccupations. European authorities has set up legislations (directive 91/414, settlement 1107/2009, directive 2009/128) aiming to reduce risks related to the use of pesticides and encouraging integrated pest management. This situation leads professionals and scientists to take interest in the biology and population dynamics of weeds and to study the impacts of integrated pest management on weeds and crops. Tillage can potentially be an efficient weed control method in winter wheat (Triticum aestivum L.). We studied wild chamomile (Matricaria chamomilla L.) population dynamics and crop yields in an experimental winter wheat crop, in relation to tillage methods. Five modalities (i.e. different combinations of a stubble cultivator and/or a moldboard plow, including a no-tillage control) were applied during three years (2009-2012), with four replications, in Gembloux (Belgium). In each plot, M. chamomilla density was recorded throughout the seasons. In summer 2012, wild chamomile density was significantly lower in plots tilled with a moldboard plow. The use of a stubble cultivator did not significantly affect M. chamomilla density. In addition, we found higher wheat yields in ploughed plots, indicating that the decrease in M. chamomilla density reduced competition for wheat. To confirm these results, experiments are still under investigation in similar conditions. [less ▲]

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See detail3. Contrôle des populations de mauvaises herbes
Jaunard, Delphine ULg; Monty, Arnaud ULg; Mahy, Grégory ULg et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detailEffect of mechanical weeding on wild Chamomile populations in winter wheat crop
Jaunard, Delphine ULg; Monty, Arnaud ULg; Henriet, François et al

in Communications in Agricultural and Applied Biological Sciences (2012, May 22)

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See detail10. Perspectives - Dynamique des populations de trois adventices des céréales en vue de la mise au point de méthodes intégrées de leur contrôle
Jaunard, Delphine ULg; Henriet, François; Monty, Arnaud ULg et al

in Livre Blanc - Céréales - Gembloux (2012, February 29)

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See detailDynamics of black-grass populations depending on the sowing time of winter wheat
Vandersteen, Joëlle; Jaunard, Delphine ULg; Mahy, Grégory ULg et al

in Communications in Agricultural and Applied Biological Sciences (2011, May 24), 76(3), 485-490

Currently, economic, agronomic and environmental concerns, lead to reduce use of herbicides. This reduction can be help by cultural measures like delay of the sowing date. Four sowing dates of winter ... [more ▼]

Currently, economic, agronomic and environmental concerns, lead to reduce use of herbicides. This reduction can be help by cultural measures like delay of the sowing date. Four sowing dates of winter wheat from 15th of October to 26th of November were tested. Dynamic of black-grass populations and their reproduction rate were assessed as well as dynamic of winter wheat for each date. Delay of sowing could significantly reduce reproduction rate of blac-grass. It was shwn that the emergence rate (pl/m²), but also number of ears per plant and number of seeds per ear of black-grass decreased significantly with the sowing date. This reproduction of seeds productioin already is from sixty per cent of a delay of two weeks sowing. [less ▲]

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See detailContribution à l'évaluation et la caractérisation de variétés de pommes de terre (Solanum sp.) des régions semi-arides des Andes boliviennes
Jaunard, Delphine ULg

Master's dissertation (2010)

The Andean area is regarded as one of the greatest world centers of biodiversity and a major center of domestication, especially, the potato (Solanum sp.). Nowadays, this plant constitutes one of the most ... [more ▼]

The Andean area is regarded as one of the greatest world centers of biodiversity and a major center of domestication, especially, the potato (Solanum sp.). Nowadays, this plant constitutes one of the most important productions of the economy and the Bolivian food. The potato represents one of the principal means of subsistence for the Bolivian farmers who cultivate many indigenous varieties of them. But the recent climate changes threaten this culture. Episodes of hail, freezing, rains and drought more intense and more frequent than before were reported by the farmers of two areas of Bolivian Altiplano (Llallagua and Cariquina Grande). These farmers were questioned within the framework of this work. They wish to take measures of adaptation to face up the climate changes. One of these measures is the identification and the improvement of tolerant varieties of potatoes to some abiotic factors and the drought in particular. This work, made in collaboration with PROINPA foundation (Fundación para Promoción e Investigación de Productos Andinos), has highlighted, among accessions of potatoes from the national bank from tubers and roots of Bolivia, accessions tolerant or sensitive to the drought. The method for the extraction of the DNA “FTA” (Whatman paper) was also tested with little success and was compared with the CTAB method usually used. Thereafter, the DNA obtained with these methods of extraction could be used in molecular tests in marker assisted selection with molecular markers associated with abiotic factors [less ▲]

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