Document Detail

Incorporation of intraguild predation into a pest management decision-making tool: the case of thrips and two pollen-feeding predators in strawberry.
MedLine Citation:
PMID:  20857715     Owner:  NLM     Status:  MEDLINE    
Action thresholds are traditionally based on the density of pests and the economic damage they cause to crops. Pest damage assessments are usually made in a "sterile" environment, devoid of extenuating factors such as predators, parasitoids, and alternative food sources. Recently, the effects of a predator or parasitoid species have been considered. However, interactions between natural enemy species (intraguild predation and interference), which are common in agricultural fields, have not been incorporated yet into decision-making tools. We conducted a series of leaf disc and potted plant trials to evaluate the effects of two predator species, the anthocorid Orius laevigatus (Fieber) and the phytoseiid Neoseiulus cucumeris (Oudemans) on the density of and fruit damage inflicted by western flower thrips, Frankliniella occidentalis (Pergande). We then used the obtained results to develop a pest management decision-making tool for the control of western flower thrips. Because strawberries (Fragaria x ananassa Duchesne) flower in cycles, pollen, a food source for both predators and the pest, is periodically available in the system and has also been incorporated in our decision-making tool. The developed new management tool would allow the relaxation of the economic threshold (ET) for western flower thrips in strawberry flowers. The presence of an average of a single O. laevigatus per flower for example, may allow that relaxation of the ET by 40% (from 10 to 14 western flower thrips per flower) when pollen is available during the winter. Because field monitoring shows that O. laevigatus populations in Israeli strawberry often reach mean densities of three to four per flower, the new approach promises to drastically reduce the employment of toxic insecticides.
Sulochana Shakya; Moshe Coll; Phyllis G Weintraub
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of economic entomology     Volume:  103     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-09-22     Completed Date:  2010-10-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1086-93     Citation Subset:  IM    
Department of Entomology, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel.
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MeSH Terms
Flowers / parasitology
Fragaria / parasitology*
Fruit / parasitology
Insects / physiology*
Pest Control, Biological / methods*
Plant Leaves / parasitology
Predatory Behavior / physiology*

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