Search results for "Herb"
showing 10 items of 856 documents
Regional study of herbicide resistance of Alopecurus myosuroides Huds. in France
2006
International audience; Since the 1990s in the north-west of Europe, the spread of herbicide resistance in wheat weeds such as Alopecurus myosuroides Huds. (blackgrass) is becoming more and more important. In the French administrative district Côte d’Or resistance to fenoxaprop within A. myosuroides populations was first detected in 1996. In 2003, 149 fields from this district were randomly sampled and about 125 A. myosuroides populations were tested for herbicide resistance. The agronomic history of all sites was investigated. Most the populations of A. myosuroides investigated contained at least 50 % of plants with resistance to fenoxaprop. In 53 and 9 % of these populations at least 50 %…
Autumn herbicides, an efficient chemical tool against ergot of grasses
2013
Maktheshim Agan France analyzed 14 weeding trials, carried out in 2011-2012, to identify the indirect effect of weeding on the development of ergot. Field trials were set up on straw cereals (rye, wheat and triticale), with a contamination of ergot sclerotia and artificial infestation of grassy weeds susceptible to sulfonylureas. Two herbicides: isoproturon and chlortoluron, used alone or followed by a sulfonylurea, were compared to untreated control. All the assessments show that herbicides decreased the amount of sclerotia and even more the alkaloid content in harvest. This effect was higher with the herbicide program (urea applied in autumn /sulfonylurea at the end of winter). This study…
How ALS-inhibitor herbicide-resistant cultivars impact on weed resistance occurrence and management ?
2013
As soon as herbicides inhibiting the acetolactate synthase (ALS, or AHAS) were commercially released, research on herbicide-resistance genes was launched by industry and resulted before the end of the 80s in a wide diversity of resistant crop germplasms. Herbicide-resistant material was obtained by all diverse kinds of breeding techniques, but mainly mutants were used as commercial cultivars. According to the mutation place along the herbicide-binding domain corresponding DNA sequence, resistance is conferred to sulfonylureas (SU) or imidazolinones (IMI), and in some instances to both with various degrees of efficiency. These herbicides are used against a large panel of annual and perennial…
Weed and corn recognition using 2D and 3D data fusion
2001
National audience
A method for recognizing vegetal species from multispectral images
1999
International audience
A two dimensional method for recognising weeds from multiband image processing
1999
International audience
A method for 3D reconstruction of vegetation by stereovision
1999
International audience
Evaluation de la pertinence de l'utilisation de mélanges d'herbicides pour le contrôle et la gestion des populations d'adventices résistantes
2008
Diplôme : Dr. d'Universite
A trait-based analysis of cover crop strategies for resource acquisition and use: application to weed control in banana cropping systems
2014
International audience
Management of herbicide-resistant weed beet: a simulation study
2009
International audience; In regions of sugar beet cultivation, weed beet infestations are responsible for economic losses. Weed beet belongs to the same species as the cropped plant, thus rendering herbicide control impossible in conventional sugar beet where costly practices such as manual weeding of bolters must be carried out instead. Genetically-modified herbicide-tolerant (GMHT) sugar beet varieties might provide an alternative in fields heavily infested with weed beet. However, accidental bolting of GMHT plants would result in pollen-mediated transgene flow towards weed beets. The objective of the present paper was to use a spatiotemporal simulation model for comparing three production…