Evaluation of Sampling Methodology for Determining the Phenology, Relative Density, and Dispersion of Western Flower Thrips (Thysanoptera: Thripidae) in Nectarine Orchards

Western flower thrips, Frankliniella occidentalis (Pergande), cause serious economic damage to nectarines in the Okanagan and Similkameen Valleys, British Columbia, Canada. We evaluated several sampling methods for western flower thrips for their precision and ability to predict general population t...

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Bibliographic Details
Published in:Journal of economic entomology 2000-04, Vol.93 (2), p.494-502
Main Authors: Pearsall, Isobel A., Myers, Judith H.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
dispersion
Frankliniella occidentalis
Fruit
Fundamental and applied biological sciences. Psychology
Insecta
nectarines
Phytopathology. Animal pests. Plant and forest protection
Population Density
Protozoa. Invertebrates
Records, symptoms, damages, economic importance, population surveys
SAMPLING AND BIOSTATISTICS
sampling methodology
stonefruit integrated pest management
western flower thrips
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Summary:Western flower thrips, Frankliniella occidentalis (Pergande), cause serious economic damage to nectarines in the Okanagan and Similkameen Valleys, British Columbia, Canada. We evaluated several sampling methods for western flower thrips for their precision and ability to predict general population trends. Beating of branches, flicking of buds, and visual estimation methods were not accurate for estimating numbers of thrips in nectarine buds. Thrips caught on sticky cards indicated general population trends, but were less efficient than collecting nectarine buds and counting thrips. Searching for thrips from buds in the field underestimated the density of both adults and larvae, and for adults, underestimated the proportion of the pale morph of western flower thrips. Dispersion patterns of thrips populations among orchards were either random or aggregated dependent on the development stage of the nectarine buds.
ISSN:0022-0493
1938-291X
DOI:10.1603/0022-0493-93.2.494