Fitness comparison inPhytoseiulus persimilis strains resistant and susceptible to methidathion |
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| Authors: | D Fournier M Pralavorio J Coulon J B Berge |
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| Institution: | (1) Station de Zoologie et de Lutte Biologique, INRA, 06600 Antibes, France;(2) Station de Phytopharmacie, CNRA, 78000 Versailles, France;(3) Station de Nématologie et de Génétique Moléculaire des Invertébrés, INRA, 06600 Antibes, France |
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| Abstract: | The effect of selection for methidathion resistance on fitness components of aP. persimilis strain was analysed by different means. The resistant strain was compared with the susceptible one from which it was selected. The life history and some parameters essential to the successful use of this species in biological control (voracity, resistance to starvation and drought) were analysed. Methidathion resistance was followed for 6 months under rearing conditions free of insecticide in the resistant and in a mixed strain. The investigations showed that the fitness of resistant mites did not seem altered by methidathion selection. It thus appears possible to increase pesticide resistance in beneficial arthropods without adversely affecting their main fitness components. |
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