biopesticides
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INRA - Lutte biologique contre charançon rouge et papilllon palmivore

INRA - Lutte biologique contre charançon rouge et papilllon palmivore | biopesticides | Scoop.it
Charançon rouge et papillon palmivore sont arrivés sur le continent européen sans ennemi naturel susceptible de réguler leur population.
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Valoriser les rotations et les périodes de semis

Valoriser les rotations et les périodes de semis | biopesticides | Scoop.it
ARVALIS - Institut du Végétal vous présente les effets de l'alternance des cultures de printemps et d'hiver sur la pression adventice.

Via Agriculture Nouvelle
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The impact of strain diversity and mixed infections on the evolution of resistance to Bacillus thuringiensis

Pesticide mixtures can reduce the rate at which insects evolve pesticide resistance. However, with live biopesticides such as the naturally abundant pathogen Bacillus thuringiensis (Bt), a range of additional biological considerations might affect the evolution of resistance. These can include ecological interactions in mixed infections, the different rates of transmission post-application and the impact of the native biodiversity on the frequency of mixed infections. Using multi-generation selection experiments, we tested how applications of single and mixed strains of Bt from diverse sources (natural isolates and biopesticides) affected the evolution of resistance in the diamondback moth, Plutella xylostella, to a focal strain. There was no significant difference in the rate of evolution of resistance between single and mixed-strain applications although the latter did result in lower insect populations. The relative survivorship of Bt-resistant genotypes was higher in the mixed-strain treatment, in part owing to elevated mortality of susceptible larvae in mixtures. Resistance evolved more quickly with treatments that contained natural isolates, and biological differences in transmission rate may have contributed to this. Our data indicate that the use of mixtures can have unexpected consequences on the fitness of resistant and susceptible insects.


Via Plant Breeding and Genomics News
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Lutte biologique : utiliser les insectes auxiliaires | Échos Jardins

Lutte biologique : utiliser les insectes auxiliaires  | Échos Jardins | biopesticides | Scoop.it
Il existe une alternative moins nocive pour lutter contre les ravageurs du jardin.
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La guerre à la pyrale du buis est déclarée - Le Parisien

La guerre à la pyrale du buis est déclarée - Le Parisien | biopesticides | Scoop.it
Le Parisien La guerre à la pyrale du buis est déclarée Le Parisien Ses hommes pulvérisent ainsi tous les buissons d'une préparation composée, entre autres, d'une bactérie, le Bacillus thuringiensis, qui permet la destruction de l'appareil digestif...
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