caa a22 4500 469060840 CHVBK 20180323132856.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF01200572 doi (NATIONALLICENCE)springer-10.1007/BF01200572 Factors affecting biological control of apple mites by mixed populations of Metaseiulus occidentalis and Typhlodromus pyri [Elektronische Daten] [B. Croft, I. MacRae, K. Currans] Metaseiulus occidentalis (Nesbitt) andTyphlodromus pyri Scheuten have complementary features/ traits that enable them to control effectively plant-feeding mites on apple. Populations of both predators gave as good or better biological control of the apple rust mite (Aculus schlechtendali Nalepa), European red mite (Panonychus ulmi Koch) and two-spotted spider mite (Tetranychus urticae (Koch)) than single-predator populations. With mixed predators,M. occidentalis provided better control of spider mites the first season after release, butT. pyri gave better control in the second season. Several factors affected the ability of predators to provide biological control: When prey were dense,M. occidentalis rapidly increased during the warm mid-summer, whileT. pyri provided greater predation when it was cool at the start or end of the growing season. When few prey were present, searching byM. occidentalis was more confined on individual apple leaves, but it migrated between leaves and trees more often. Pollen feeding, cannibalism and interspecific predation were more common byT. pyri. In fall, oviposition byM. occidentalis stopped sooner and in the following spring,T. pyri reproduced beforeM. occidentalis. Research needs and management of mixed-predator populations are discussed. Elsevier Science Publishers B.V., 1992 Croft B. Department of Entomology, Oregon State University, 97331, Corvallis, OR, USA aut MacRae I. Department of Entomology, Oregon State University, 97331, Corvallis, OR, USA aut Currans K. Department of Entomology, Oregon State University, 97331, Corvallis, OR, USA aut Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 343-355 0168-8162 14:3-4<343 1992 14 10493 https://doi.org/10.1007/BF01200572 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01200572 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Croft B. Department of Entomology, Oregon State University, 97331, Corvallis, OR, USA aut NATIONALLICENCE 700 1- MacRae I. Department of Entomology, Oregon State University, 97331, Corvallis, OR, USA aut NATIONALLICENCE 700 1- Currans K. Department of Entomology, Oregon State University, 97331, Corvallis, OR, USA aut NATIONALLICENCE 773 0- Experimental & Applied Acarology Kluwer Academic Publishers 14/3-4(1992-06-01), 343-355 0168-8162 14:3-4<343 1992 14 10493 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer