caa a22 4500 469060794 CHVBK 20180323132856.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF01200570 doi (NATIONALLICENCE)springer-10.1007/BF01200570 Dispersal and gene flow of pesticide resistance traits in phytoseiid and tetranychid mites [Elektronische Daten] [John Dunley, Brian Croft] Dispersal and gene flow of pesticide resistance traits in phytoseiid and tetranychid mites are discussed relative to their biologies and resistance management. The focus is on deciduous fruit-tree crops whereTyphlodromus pyri Scheuten andMetaseiulus occidentalis (Nesbitt) can effectively control spider mite pests. Oregon populations ofM. occidentalis were more dispersive thanT. pyri, as evidenced by movement to small apple trees placed inside and outside of commercial apple orchards. This difference was corroborated by the spatial distributions of organophosphate resistance in populations from sprayed orchards and nearby unsprayed habitats:T. pyri showed patchy, local patterns of resistance whileM. occidentalis showed more regional, homogeneous trends. Gene flow among populations was estimated from allozymic variation ofT. pyri. Intra- and inter-population genetic variation was high enough to prevent population differentiation. Thus, allozymic estimates of gene flow were higher than that indicated by pesticide resistance patterns. Dispersal inTetranychus urticae Koch is also discussed relative to resistance evolution. Immigration of resistant phenotypes from crops or other sprayed habitats can increase the frequency of resistance. Immigration of susceptible individuals from surrounding unsprayed habitat into a sprayed crop can slow resistance or lead to its reversion, depending on the level of gene flow between populations. Dispersal within crops can have the same effect if susceptibles come from a refuge. In pears, immigration of susceptibleT. urticae from nearby habitat and groundcover aided in reversion of organotin resistance. Experiments on resistance management tactics forT. urticae are discussed. Elsevier Science Publishers B.V., 1992 Dunley John Dept. of Entomology, Oregon State University, 97331-2907, Corvallis, OR, USA aut Croft Brian Dept. of Entomology, Oregon State University, 97331-2907, Corvallis, OR, USA aut Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 313-325 0168-8162 14:3-4<313 1992 14 10493 https://doi.org/10.1007/BF01200570 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01200570 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dunley John Dept. of Entomology, Oregon State University, 97331-2907, Corvallis, OR, USA aut NATIONALLICENCE 700 1- Croft Brian Dept. of Entomology, Oregon State University, 97331-2907, Corvallis, OR, USA aut NATIONALLICENCE 773 0- Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 313-325 0168-8162 14:3-4<313 1992 14 10493 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer