ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996
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ISSN 1362-1971 An international journal of the Systematic and Applied Acarology Society, published since 1996 [Aims] [Editors] [Content] [Subscriptions] [Contact details] [Society Homepage] |
Systematic & Applied Acarology (2002) 7, 35-48Efficacy of different release strategies of
Neoseiulus californicus McGregor and Phytoseiulus persimilis Athias Henriot (Acari: Phytoseiidae) for the control of two-spotted spider mite (Tetranychus urticae Koch) on greenhouse cut rosesSYLVIA BLÜMEL & ANDREAS WALZER
Federal Office and Research Centre for Agriculture, Institute of Phytomedicine Spargelfeldstr. 191, A-1226 Vienna, Austria
Abstract
Separate and combined releases of P. persimilis and N. californicus were tested for the control of T. urticae on
greenhouse cut roses under integrated pest management conditions. Release strategies were carried out in
separate greenhouses and were not replicated. Mite densities were controlled at regular intervals on 50 single,
randomly collected leaves per greenhouse. Natural infestations of 23.9 T. urticae per leaf at the start of the trial
were controlled throughout the growing season by the simultaneous, combined release of 26 P. persimilis/m²
and 24 N. californicus/ m². Separate releases of each phytoseiid species - 32 P. persimilis/m² at an initial
infestation of 0.16 T. urticae per leaf, or 51 N. californicus/m² in total at an initial infestation of 10.2 T. urticae
per leaf - failed to adequately suppress spider mite populations. Additional treatments with selective acaricides
were required. Reasons for the different control success of the three release strategies and their implications for
practical use are discussed.
Key words: greenhouse roses, biological control, integrated control, Tetranychus urticae, Phytoseiulus
persimilis, Neoseiulus californicus
Copyright 1999-2002 Systematic and Applied Acarology Society
Last updated 15 Jul. 2002
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