Management of apple orchards to conserve generalist phytoseiid mites suppresses two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae)

Ken Funayama, Michiyo Komatus, Shoji Sonoda, Isao Takahashi, Kazuko Hara

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

To improve the success of integrated pest management (IPM) in apple orchards, we investigated whether generalist phytoseiid mites have suppressed the occurrence of Tetranychus urticae. In Akita Prefecture, northern Japan, in 2012 and 2013, two types of experimental plot were compared. Conservation plots had been managed for the conservation of generalist phytoseiid mites by selective chemical spraying without mowing since 2009. Conventional plots were managed by non-selective chemical spraying with regular mowing. The conservation plots had significantly fewer T. urticae adult females per tree in both years. Two species of generalist phytoseiid mites—Typhlodromus vulgaris and Amblyseius tsugawai—were continuously present in the conservation plots, with only a few T. urticae. The conservation plots had significantly more A. tsugawai adult females in the undergrowth in both years, and significantly more T. vulgaris adult females on apple leaves in 2012. Typhlodromus vulgaris was continuously present in the conservation plots but was scarce from late May to early August in the conventional plots. In the presence of T. vulgaris, low numbers of T. urticae did not increase on apple leaves. These results indicate that the generalist phytoseiid mites serve as important biological control agents in IPM in apple orchards.

Original languageEnglish
Pages (from-to)43-54
Number of pages12
JournalExperimental and Applied Acarology
Volume65
Issue number1
DOIs
Publication statusPublished - Jan 1 2015

Keywords

  • Amblyseius tsugawai
  • Apple
  • Selective chemical
  • Tetranychus urticae
  • Typhlodromus vulgaris
  • Without mowing

ASJC Scopus subject areas

  • Ecology
  • Insect Science

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