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Response of Neoseiulus fallacis Garmen and Galendromus occidentalis Nesbitt (Acari: Phytoseiidae) to Tetranychus urticae Koch (Acari: Tetranychidae)-Damaged Hop Humulus lupulus (L.) (Urticales: Cannabaceae)

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Abstract:

Abstract 

1 The response of Neoseiulus fallacis Garmen and Galendromus occidentalis (Acari: Phytoseiidae) to Tetranychus urticae Koch (Acari: Tetranychidae)-damaged and undamaged hop, Humulus lupulus (L.), plants was tested using a Y-tube olfactometer.

2 Neoseiulus fallacis but not G. occidentalis was attracted to volatiles from T. urticae-damaged hop plants when paired with undamaged plants.

3 The response of N. fallacis to these volatiles was stronger for plants severed at the soil surface than for intact plants.

4 There was no difference in the response of N. fallacis to severed or intact hop plants that had no spider mite damage, indicating that artificial wounding by severing alone does not elicit the production of attractive volatiles detectable to N. fallacis. These results are consistent with the existence of cross-talk between signalling pathways initiated by feeding damage and artificial wounding that result in elevated levels of predator-attracting volatiles.

Keywords: Galendromus occidentalis; Humulus lupulus; Neoseiulus fallacis; Tetranychus urticae; Y-tube plant volatiles; olfactometer

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1461-9555.2005.00267.x

Affiliations: 1: Department of Entomology, 204 Center for Integrated Plant Systems, Michigan State University, East Lansing, MI 48824, U.S.A., 2: University of Idaho, Department of Plant, Soil and Entomological Sciences, Moscow, ID 83844, U.S.A. and 3: University of Idaho, Parma Research and Extension Center, 29603 U of I Lane, Parma, ID 83660, U.S.A.

Publication date: 2005-08-01

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