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DISTRIBUTION OF METASEIULUS OCCIDENTALIS (NESBITT) AND TYPHLODROMUS PYRI SCHEUTEN (PARASITIFORMES: PHYTOSEIIDAE) IN APPLE ORCHARDS OF THE HOOD RIVER VALLEY, OREGON

Published online by Cambridge University Press:  31 May 2012

B.A. Croft ,
P. Shearer ,
G.J. Fields  and
H.W. Riedl
B.A. Croft
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331
P. Shearer
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331
G.J. Fields
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331
H.W. Riedl
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331
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Abstract

In a survey of predaceous phytoseiid mites from 65 apple blocks in the Hood River Valley, Oregon, Metaseiulus occidentalis (Nesbitt) and Typhlodromus pyri Scheuten were the principal species present. Metaseiulus occidentalis predominated over T. pyri by a ratio of about 2:1 in 1984 mites collected during 1985. In experimental, commercial, and integrated pest management blocks, M. occidentalis was present alone or predominated over T. pyri in up to 88% of the blocks, whereas T. pyri occurred alone or predominated in up to 20% of the blocks. Both species occurred in near equal proportions in a maximum of 20% of blocks. An analysis of nine factors influencing the relative abundance of M. occidentalis and T. pyri indicated that vegetation in the habitat surrounding the block and the pesticides used were most important. In 1986, seasonal distributions and proportions of predatory mites found in individual blocks were similar to those found in 1985. The feasibility of managing mixed populations of T. pyri and M. occidentalis in Hood River orchards is discussed.

Résumé

Lors d’un inventaire des acariens prédateurs phytoséiides dans 65 parcelles de pommier dans la Vallée de la Rivière Hood en Oregon, Metaseiulus occidentalis (Nesbitt) et Typhlodromus pyri Scheuten se sont avérées les principales recensées. Metaseiulus occidentalis prédominait sur T. pyri dans un rapport de 2 : 1 dans les populations de 1984 collectées en 1985. Dans des parcelles expérimentales, commerciales et régies par un programme de lutte intégrée, M. occidentalis était seul présente ou prédominait sur T. pyri dans 88% tout au plus des parcelles, alors que T. pyri était seule ou prédominait dans 20% au plus des parcelles. L’analyse de neuf facteurs influençant l’abondance relative de M. occidentalis et T. pyri a indiqué que la végétation entourant la parcelle et les pesticides utilisés étaient les plus importants. En 1986, la distribution saisonnière et la proportion des espèces dans les parcelles étaient similaires à celles de 1985. On commente la possibilité de gestion de populations mixtes de T. pyri et M. occidentalis dans les vergers de la Rivière Hood.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 1 , February 1990 , pp. 5 - 14
Copyright
Copyright © Entomological Society of Canada 1990

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