Jean-Michel Vassal

  • Citations Per Year
Learn More
Between plagues, the solitarious desert locust (Schistocerca gregaria) is generally thought to exist as small populations, which are particularly prone to extinction events in arid regions of Africa and Asia. Given the high genetic structuring observed in one geographical area (the Eritrean coast) by former authors, a metapopulation dynamics model involving(More)
The cotton bollworm Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) is a key pest of various cropping systems in West and Central Africa, and developed insecticide resistance recently. To understand how such insecticide resistance expands across the region, the genetic structure of bollworm populations was studied using microsatellite markers. At(More)
Pyrethroid resistance in Helicoverpa armigera (Hübner) field populations was investigated in Benin over several years by using third- and fourth-instar larval topicalbioassays. H. armigera was resistant to pyrethroids tested as cypermethrin, deltamethrin, bifenthrin, and fenvalerate. Pretreatment with piperonyl butoxide significantly decreased the LD50(More)
Genetically-modified coffee clones (GMCs) were presented in a previous work. They were created from a single commercial clone of Coffea canephora Pierre (clone 126). Therefore they all have the same genotype, except for the localization of the transgenic insertions. They synthesize the Bacillus thuringiensis endotoxin Cry1Ac against Leucoptera coffeella(More)
  • 1