AERIAL DISPERSAL AND FIELD EFFICACY OF A GENETICALLY IMPROVED STRAIN OF THE SPIDER MITE PREDATOR METASEIULUS OCCIDENTALS

摘要: In August 1979, a strain of Metaseiulus occidentalis resistant to carbaryl and organophosphorus (OP) insecticides was released into few trees at one edge 32-hectare commercial almond orchard near Bakersfield, California. 1980, predators collected from 7 widely separated sites in the had moderate high levels resistance, indicating established, multiplied, overwintered, dispersed release site. During substantial impact on spider mite populations. Aerial dispersal M. suspected this because moved so far quickly. Predators sampled April September 1981 were still resistant, that survived 2nd year orchard. The carbaryl-OP-resistant also every 3rd tree row Livingston, California June inter-tree occurred within month. exerted considerable control over mites orchard, as well. monitored by trapping large numbers females sticky panels located outside This is first documentation disperses aerially field, suggests may be capable orchards. It time laboratory-selected has been shown effective orchards, previous trials used only 10–30 plots. RESUME Dispersion aerienne et efficacite au verger d'une souche genetiquement controlee de occidentals, Acarina, Phytoseiida, acarien predateur tetranyques Une resistante aux organophosphores ete liberee en aout 1979 dans quelques arbres bordure d'un d'amandiers 32 hectares pres Bakersfield (Californie). En des predateurs recoltes points bien separes du avaient niveaux moderes ou eleves resistance carbaryl, montrant que la s'etait etablie multipliee, avait hiverne dispersee partir lieu lacher. les resistants ont eu un effet consequent sur populations tetranyques. La dispersion occidentali subodoree ce par suite distance rapidite. Des avril septembre etaient encore prouvant cette survecu une seconde annee d'amandes. aussi arbre 3. tous 3 rangs, d'amandiers, Livingston (Californie) juin 1981; entre s'est operee 1 mois. Les exerce protection contre tetranyques aussi. capturant grand nombre panneaux englues l'exterieur verger. C'est premiere observation nature; elle permet d'envisager peut ětre depuis vergers est lachee. fois selectionnee laboratoire montree efficace grands commerciaux essais anterieurs ayant effectues exclusivement parcelles 10 30 arbres.