Serge KREITER - Academia.edu (original) (raw)
Papers by Serge KREITER
HAL (Le Centre pour la Communication Scientifique Directe), 2011
![Research paper thumbnail of Biological control of Tetranychus evansi Baker & Pritchard and Tetranychus urticae Koch by Phytoseiulus longipes Evans in tomato greenhouses in Spain [Acari: Tetranychidae, Phytoseiidae]](https://attachments.academia-assets.com/119562804/thumbnails/1.jpg)
](Biological Control, Jul 1, 2011
HAL (Le Centre pour la Communication Scientifique Directe), Jan 31, 2007
National audienc
HAL (Le Centre pour la Communication Scientifique Directe), Aug 23, 2009
National audienceGrape vines are one of the few crops in the world that is cropped only as a pure... more National audienceGrape vines are one of the few crops in the world that is cropped only as a pure crop system. Vineyards face severe environmental concerns such as soil degradation, heavy loads of pesticides and pests attacks. In Roman times, vineyard cultivation was performed as an agroforestry system called Arbustra, with vines growing on living trees used as trellises. Scattered trees such as peach, almond or olive trees were also grown in vineyards in Europe until recently. These trees have been destroyed to allow easy mechanisation of the vineyard management, including mechanical harvesting of grapes. New vineyard agroforestry plots were set up in 1996 in the south of France, and have been monitored since then for grape production and tree growth. Various tree species were introduced into vineyards, at a density of 222 trees/ha, on shallow rocky soils prone to drought. Both evergreen resinous and broadleaved deciduous tree species were introduced, with Sorbus domestica (Service tree) and Pinus pinea (Stone pine) as the key species. Control plots with pure tree and pure vine plantation were available. After 12 years of cultivation, grape production and tree growth data showed that vineyard agroforestry is possible. Tree growth is enhanced in the agroforestry system, and grape production is not yet reduced by tree competition, except on extremely shallow soils. Competition for water and/or nutrients appears to be the main limiting factor, while light competition seems not to be a problem so far. Root pruning with a sub-soiler was used to limit water competition by the trees on the vines and proved useful. Some preliminary assessments of pest predators in the vineyard system show that mite control may be enhanced by the presence of trees in vineyards. This could allow a reduction in the use of pesticides in vineyards, but more detailed studies are needed to con!rm this hypothesi
HAL (Le Centre pour la Communication Scientifique Directe), Aug 29, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Jul 11, 2016
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), 2005
HAL (Le Centre pour la Communication Scientifique Directe), 2007
Phytoseiid mite densities and diversity were surveyed on 16 plant species in two arboreta in the ... more Phytoseiid mite densities and diversity were surveyed on 16 plant species in two arboreta in the South of France. Samplings in these two arboreta were carried out on 5 trees of the same plant species twice a month during 4 months. Within the same arbouretum, densities were not significantly different within the same plant between the 5 replicated realised. However, differences in phytoseiid mite densities and diversity were seen between the plants species within each of the two arboreta. In order to determine the factors affecting these differences, foliar characteristics (trichome and domatia densities, domatia structure, pilosity of the vein axils, leaf surface) were evaluated. Multi-factorial analysis shows relationships between some of these parameters, especially domatia density and structure and pilosity on vein axils, and phytoseiid mite densities. These results are different from previous observations, as they minimise the importance of leaf trichomes on limb. This could be due to phytoseiid mite species considered, and especially to their size, larger phytoseiids being probably less able to colonise high pilose leaves. Mite densities and diversity were also different for same plants located in the 2 arboreta. Kampimo-dromus aberrans was the main species occurring in the aboretum 2 and is absent in the first one while Typhlodromus exhilaratus was the main species in the arboretum 1 but not in arboretum 2. Different factors, as ecological factors like surrounding vegetation and environment, plant community successions, soil characteristics affecting plant communities and plant physiology, could have determined abundance and diversity of phytoseiid mites.
Acarologia, 2000
Un recensement des phytoséiides a été conduit de 1985 à 1997 dans plus de 2300 parcelles de vigne... more Un recensement des phytoséiides a été conduit de 1985 à 1997 dans plus de 2300 parcelles de vigne appartenant à toutes les régions viticoles de France et aux principales pratiques culturales. Vingt-deux espèces ont été recensées, parmi lesquelles T. pyri et K. aberrans ...
HAL (Le Centre pour la Communication Scientifique Directe), Oct 24, 1989
HAL (Le Centre pour la Communication Scientifique Directe), Aug 21, 2006
The abundance and diversity of phytoseiid mites were surveyed from April to September 2003-2005 i... more The abundance and diversity of phytoseiid mites were surveyed from April to September 2003-2005 in several grape crops in the South of France, with Grenache and Syrah cultivars, co-planted with rows of Sorbus domestica or Pinus pinea and in plots with monocultures of grapes. Densities of phytoseiid mites differed on the two tree species. Pinus pinea seemed to be a better host than S. domestica. Typhlodromus exhilaratus was the dominant species in the crops and on co-planted rows of S. domestica and P. pinea, whereas T. phialatus was the most abundant species in plots with monocultures of trees. Agroforestry management does not seem to affect mite diversity in vine plots. The densities of phytoseiid mites in vine crops may well be affected by the co-plantation of trees, especially in 2005. Although the densities observed during 2003 and 2004 were probably low due to very dry and hot climatic conditions, the agroforestry management seems to have had a significant impact on mite densities in 2005. Further experiments should be carried out to confirm this effect
HAL (Le Centre pour la Communication Scientifique Directe), 2011
Biological Control, Jul 1, 2011
HAL (Le Centre pour la Communication Scientifique Directe), Jan 31, 2007
National audienc
HAL (Le Centre pour la Communication Scientifique Directe), Aug 23, 2009
National audienceGrape vines are one of the few crops in the world that is cropped only as a pure... more National audienceGrape vines are one of the few crops in the world that is cropped only as a pure crop system. Vineyards face severe environmental concerns such as soil degradation, heavy loads of pesticides and pests attacks. In Roman times, vineyard cultivation was performed as an agroforestry system called Arbustra, with vines growing on living trees used as trellises. Scattered trees such as peach, almond or olive trees were also grown in vineyards in Europe until recently. These trees have been destroyed to allow easy mechanisation of the vineyard management, including mechanical harvesting of grapes. New vineyard agroforestry plots were set up in 1996 in the south of France, and have been monitored since then for grape production and tree growth. Various tree species were introduced into vineyards, at a density of 222 trees/ha, on shallow rocky soils prone to drought. Both evergreen resinous and broadleaved deciduous tree species were introduced, with Sorbus domestica (Service tree) and Pinus pinea (Stone pine) as the key species. Control plots with pure tree and pure vine plantation were available. After 12 years of cultivation, grape production and tree growth data showed that vineyard agroforestry is possible. Tree growth is enhanced in the agroforestry system, and grape production is not yet reduced by tree competition, except on extremely shallow soils. Competition for water and/or nutrients appears to be the main limiting factor, while light competition seems not to be a problem so far. Root pruning with a sub-soiler was used to limit water competition by the trees on the vines and proved useful. Some preliminary assessments of pest predators in the vineyard system show that mite control may be enhanced by the presence of trees in vineyards. This could allow a reduction in the use of pesticides in vineyards, but more detailed studies are needed to con!rm this hypothesi
HAL (Le Centre pour la Communication Scientifique Directe), Aug 29, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Jul 11, 2016
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), 2005
HAL (Le Centre pour la Communication Scientifique Directe), 2007
Phytoseiid mite densities and diversity were surveyed on 16 plant species in two arboreta in the ... more Phytoseiid mite densities and diversity were surveyed on 16 plant species in two arboreta in the South of France. Samplings in these two arboreta were carried out on 5 trees of the same plant species twice a month during 4 months. Within the same arbouretum, densities were not significantly different within the same plant between the 5 replicated realised. However, differences in phytoseiid mite densities and diversity were seen between the plants species within each of the two arboreta. In order to determine the factors affecting these differences, foliar characteristics (trichome and domatia densities, domatia structure, pilosity of the vein axils, leaf surface) were evaluated. Multi-factorial analysis shows relationships between some of these parameters, especially domatia density and structure and pilosity on vein axils, and phytoseiid mite densities. These results are different from previous observations, as they minimise the importance of leaf trichomes on limb. This could be due to phytoseiid mite species considered, and especially to their size, larger phytoseiids being probably less able to colonise high pilose leaves. Mite densities and diversity were also different for same plants located in the 2 arboreta. Kampimo-dromus aberrans was the main species occurring in the aboretum 2 and is absent in the first one while Typhlodromus exhilaratus was the main species in the arboretum 1 but not in arboretum 2. Different factors, as ecological factors like surrounding vegetation and environment, plant community successions, soil characteristics affecting plant communities and plant physiology, could have determined abundance and diversity of phytoseiid mites.
Acarologia, 2000
Un recensement des phytoséiides a été conduit de 1985 à 1997 dans plus de 2300 parcelles de vigne... more Un recensement des phytoséiides a été conduit de 1985 à 1997 dans plus de 2300 parcelles de vigne appartenant à toutes les régions viticoles de France et aux principales pratiques culturales. Vingt-deux espèces ont été recensées, parmi lesquelles T. pyri et K. aberrans ...
HAL (Le Centre pour la Communication Scientifique Directe), Oct 24, 1989
HAL (Le Centre pour la Communication Scientifique Directe), Aug 21, 2006
The abundance and diversity of phytoseiid mites were surveyed from April to September 2003-2005 i... more The abundance and diversity of phytoseiid mites were surveyed from April to September 2003-2005 in several grape crops in the South of France, with Grenache and Syrah cultivars, co-planted with rows of Sorbus domestica or Pinus pinea and in plots with monocultures of grapes. Densities of phytoseiid mites differed on the two tree species. Pinus pinea seemed to be a better host than S. domestica. Typhlodromus exhilaratus was the dominant species in the crops and on co-planted rows of S. domestica and P. pinea, whereas T. phialatus was the most abundant species in plots with monocultures of trees. Agroforestry management does not seem to affect mite diversity in vine plots. The densities of phytoseiid mites in vine crops may well be affected by the co-plantation of trees, especially in 2005. Although the densities observed during 2003 and 2004 were probably low due to very dry and hot climatic conditions, the agroforestry management seems to have had a significant impact on mite densities in 2005. Further experiments should be carried out to confirm this effect