Search results for "Cross resistance"
showing 3 items of 3 documents
Généralités sur la résistance aux Produits de Protection des Plantes (PPP)
2015
SPEPôle GEAPSICT2Communication orale invitée; Au niveau d’un individu, la résistance « biologique » correspond à une moindre sensibilité à un PPP en comparaison d’individus sensibles de référence, mesurée au laboratoire. Un individu résistant peut être caractérisé par son facteur de résistance (l’« intensité » ou la « force » de la résistance, correspondant au rapport entre la quantité de PPP requise pour avoir le même effet sur un individu résistant que sur un individu sensible), et son profil (ou spectre) de résistance (la gamme de substances auquel l’individu sera résistant). Le caractère de résistance est transmis aux générations suivantes de bio-agresseurs, car déterminé par une ou des…
Immunization of trout (Salmo trutta) against freshwater pearl mussel (Margaritifera margaritifera) by duck mussel (Anodonta anatina) glochidia
2013
Freshwater pearl mussel Margaritifera margaritifera is endangered throughout its range of distribution in Europe. In some rivers M. margaritifera may co-occur with the duck mussel Anodonta anatina. Brown trout Salmo trutta serves as suitable fish host for both mussel species. Thus it is possible that exposure of brown trout to A. anatina glochidia might increase resistance of fish against M. margaritifera glochidia. The aim was to test this ‘cross immunity hypothesis’. Brown trout were immunized by duck mussel (Anodonta anatina) glochidia in late May. Then brown trout were challenged by pearl mussel (Margaritifera margaritifera) glochidia in late August after the A. anatina glochidia were d…
The Rapid Evolution of Resistance to Vip3Aa Insecticidal Protein in Mythimna separata (Walker) Is Not Related to Altered Binding to Midgut Receptors
2021
Laboratory selection for resistance of field populations is a well-known and useful tool to understand the potential of insect populations to evolve resistance to insecticides. It provides us with estimates of the frequency of resistance alleles and allows us to study the mechanisms by which insects developed resistance to shed light on the mode of action and optimize resistance management strategies. Here, a field population of Mythimna separata was subjected to laboratory selection with either Vip3Aa, Cry1Ab, or Cry1F insecticidal proteins from Bacillus thuringiensis. The population rapidly evolved resistance to Vip3Aa reaching, after eight generations, a level of >3061-fold resistance…